In Internet forums and similar gatherings of cognoscenti, writers often use abbreviations for the sake of efficient self-expression. Here are some of the more common abbreviations you will encounter in Internet communications:

AFAIK: And furthermore, all is kaput.

BTW: Big tall weeds.

FWIW: Found watermelon, ingested watermelon.

IMHO: I may have overeaten.

OTOH: Over the old hamburger.

ROFL: Random outburst from lungs.

TOS: Terms of slavery.

TL;DR: Tried levitating; damaged rump.