= In My Arrogant Opinion
You knew that, but I just got it. :smack:
Usually it’s LMAO. As in, Laughing My Ass Off.
The opposite, of course, of IMHO, In My Humble Opinion.
But you knew that. 
<mod>
IMTTM
(I’m Moving This To MPSIMS)
</mod>
IMAO is In My Ass … Ow!
It’s bizarre, recursive, and vaguely obscene.
I think I’m in love.
Ufia!
How odd.
I’ve seen many abbreviation threads at SDMB, and they were all at ATMB.
KDJL
SLTSBOAWOMDAW
Someone Left Their Sweaty Bottle Of Aquafina Water On My Desk At Work
In Tepper Isn’t Going Out, the paranoid mayor had an eye-scanner and a Body Orifice Security Scanner (BOSS) outside his office to make sure no imposters or weapon carriers got in.