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1.
A French adaptation of the term Lmao (Laughing my ass off). It is an acronym for 'Rire mon cul off"
This term leads people to believe to that you may be more sophisticated or classy than you actually are.
Jess: I had sausage for breakfast today

Matt: I bet you had sausage for breakfast ;) RMCO.
by mjrcp October 01, 2010