Expressing emotions and feelings
HIFW – How I feel when

HIFW has become one of the most common text abbreviations in funny, sarcastic memes and gifs on Twitter, Instagram, and Facebook.  Another example with the full words is also frequently used in blogs and FB posts.

TFW – That feeling when. TFW internet slang often goes in a caption to an image.

MFW – My face when

MRW – My reaction when

IFYP – I feel your pain

LOL – Laughing out loud

TNTL – Trying not to laugh

JK – Just kidding

IDC – I don’t care

ILY – I love you

IMU – I miss you

ADIH – Another day in hell

IDC – I don’t care

ZZZ – Sleeping, bored, tired

WYWH – Wish you were here

TIME – Tears in my eyes

BAE – Before anyone else

You can use it referring to a person who you care for the most. E.g. Me and my BAE have just watched another episode of Game of Thrones!

SSDD – Same stuff, different day

QQ – Crying

For me, the origin of QQ abbreviation is really surprising. According to Urban Dictionary, at first, QQ meant to quit the game Warcraft II by pressing the hotkey Alt+QQ. Hence, when a player started whining, others offered him to QQ. Soon, it was associated with crying eyes and used in texting and tweeting as well.

FIMH – Forever in my heart

BSAAW – Big smile and a wink

BWL – Bursting with laughter

LMAO – Laughing my a** off

BFF – Best friends forever

CSL – Can’t stop laughing

Expressing Opinion and Reaction
IMOIMHO – In my opinionIn my humble opinion

OMDB – Over my dead body

NTH – Nice to have. what does nth mean in texting messaging

POV – Point of View

TBH – To be honest

FTW – For the win

WTF – What the f***

This and the following examples belong to internet slang abbreviations describing something of the best or low (FTL) quality. If you say something is FTW, then it can be splendid, amazing, perfect, etc.

FTL – For the loss

YNK – You never know

SMH – Shaking my head

Describing the reaction to something stupid, aggressive, hostile, unfair, etc.
SRSLY – Seriously

YGTR – You got that right

GMTA – Great minds think alike

It is sometimes confused with GMAT (Graduate Management Admission Test); however, those who have gone through that painful preparation to exam could always tell the difference. The abbreviation, which refers to the common way of thinking, has become mainstream and even placed as a print on cups, pillows, shirts, etc.

AYMM – Are you my mother?

CWOT – Complete waste of time

Disclaimers
AYMM – Are you my mother?

CWOT – Complete waste of time

Disclaimers
IANAL – I am not a lawyer

Next time you share any law-related advice in a public chat, put IANAL or its analogue TINLA (This is not legal advice) so that you are not accused of unlicensed consultation. In the U.S. and other countries, even a small recommendation on how to deal with your assets or running a divorce case can be regarded as unauthorized law practice.

AFAIK – As far as I know

AFAIR – As far as I remember

AFAIC – As far as I’m concerned

ASL – Age, sex, location

AAMOF – As a matter of fact

FWIW – For what it’s worth

YMMV – Your mileage may vary

IIRC – If I remember correctly

DM – Direct message

AFAICT – As far as I can tell

TL;DR – Too long; didn’t read

You can reply with this abbreviation not only to emphasise how long the post is but also to explain that you’ve been too lazy to read and just ignored it. Which is why TL;DR also means Too lazy; didn’t read. Later, it gave birth to ToS; DR (Terms of service; didn’t read). As you may know, many people skip studying this part of a website because of the complex law terms and long sentences.

Attracting attention
IRL – In real life

TIL – Today I learned

SOML – Story of my life. What does SOML mean in texting? Most likely a person compares another person’s story with own situation.

EMBM – Early morning business meeting

J4F – Just for fun

JSYK – Just so you know

FAWC – For anyone who cares

RLRT – Real life retweet

OH – Overheard

WUZUP – What’s up?

CS – Career suicide

DWH – During work hours

Notifications, wishes, greetings, closings
OMW – On my way

GRATZ – Congratulations

GL – Good luck

IDK – I don’t know

TTYL – Talk to you later

BRB – Be right back

W8 – Wait

NFS – Not for sale

B4N – Bye for now

B@U – Back at you

BBBG – Bye bye be good

BBIAS – Be back in a sec

RUOK – Are you OK?

CYT – See you tomorrow

DBMIB – Don’t bother me I’m busy

DM – Direct message

GFN – Gone for now

AFK – Away from keyboard

Warning and recommendation
NSFW – Not safe for work

If you see this kind of abbreviation posted near a specific link, then do not click it. Most likely, NSFW acronym will lead to some sexual, nude, brutal or violent content banned to view at your working place.

NSFL – Not safe for life

It refers to even more offensive and shocking content which can possibly cause mental harm.

SFW – Safe for work

GRAS – Generally recognised as safe

NBD – Not big deal

OC – Original content

4AO – For adults only

OP – Original poster

This refers to someone who was the first to publish a post.

PPL – People

ICYMI – In case you missed it

JIC – Just in case

NAGI – Not a good idea

GOI – Get over it

RBTL – Read between the lines

AYOR – At your own risk

DIY – Do it yourself

E123 – Easy as one, two, three

GAHOY – Get a hold of yourself

Asking for a favor or advice
TMB – Tweet me back

WTPA – Where the party at?

DAE – Does anyone else?

PRT – Please retweet

PTB – Please text back

TIA – Thanks in advance

BUMP – Bring up my post

Fonte: Preply