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Roflmgdao = Rolling on floor laughing my god damn ass off. Related to rofl, lmao,and roflmao. Usually used when someone says something a bit funnier than something that would call for a rofl or a roflmao.
Dude 1: Dude you won't believe what happened to me today!

Dude 2: What?

Dude 1: I woke up and smelled somethin weird right?...so when i looked my cat was sitting with its butt in my face!

Dude 2: Roflmgdao!
by Enrai November 15, 2008
Acronym for: Rolling on the Floor Laughing My God Damn Ass Off.
Her: I think I love you.
by swedishbasteve October 13, 2011