Laugh my grillz off
Usually used by black people and/or gangsters
Gangster 1: I just got arrested by the popo
Gangster 2: LMGO!
LOL My Guts Out
To laugh (out loud) so hard, that ones guts leave the body through the mouth. This is a new generation of acronym that actually contains an acronym
"My mom caught me masterbating yesterday"
"Dude its not funny"