Laughing my ass off, almost rolling on the floor, but not quite
Used in situations where you feel like your ass will fall off but your still sitting in your chair, about to start rolling on the floor
Person #1 "Hahaha is that a guy or a girl?!"
Person #2 "LMAOAROTFBNQ! I don't know!!"
Person #1 "OMG it's Mr Potato Head!"
Person #2 "ahahah I'm lmaoarotfbnq!"