Abbr: ‘Laughing my ass off’. Also: LMFAO as in ‘laughing my f*cking ass off’. Used when texting, or in the case of LMFAO, also when you want to imply something was hilarious without having to swear.
Sam: ...To get to the other side!
Alex: Lmao!
Sam: When I first heard it, I laughed my ass off too!