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The act of licking the foam from the inside of a coffee cup, often compared to a sexual act due to how enjoyable and suggestive it is.
Guy 1: Dude, how'd you get cappuccino froth all over you face?
Guy 2: Oh, I performed coffee cup cunnilingus a minute ago.
Guy 1: Shit, you got some in your eyebrows.
Guy 2: Yeah I really get into it.

Girl: That's kinda hot.
by jag-d August 04, 2011
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