@tk From "When HARLIE was One v2.0" by David Gerrold*
The poem HARLIE wrote is actually
"IBM,
You BM,
We all BM,
For IBM."
* I have a copy of "When HARLIE was One" but finding the Expanded Novel has proven to be an unsuccessful tri-decade hunt. At one point I actually contacted Mr. Gerrold to ask if he knew if there was a secret stash or a hidden copy for sale and he sadly replied that he wasn't aware of such a stash.
Disclaimer: I'm the Treasurer for the "I Hate David Gerrold Fan Club".