Top definition
Most Definetley: a saying that means most definetley. use when you are drunk,stoned or on the verge of pukeing.
Guy1:hey dude you wanna go party?
Guy2:Mo Deff man! Mo Deff!
by Garrett Silva May 05, 2005
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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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