As is. Describes a drink that just tastes like an orgy in a cup. Such a drink would taste so delicious, that it would most likely have to be banned around the world because it would soon become an addictive substance. Due to the fact that many people have varying taste-buds, the specific drink may vary on a person-to-person basis.
You have to try that new Monster. I drank it and five seconds late, I destroyed Pluto with my pinky. I'm not kidding, that stuff was "Sexinacup (Sex in a cup).
by I Plead to Fifth May 25, 2010
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A cup which holds cum, primarily after sex.

This was mainly brought into the world by Shane Dawson off one of his"Emo Bop" video where he was pictured with some 'girls' (which was his dressed up). One picked up a cup and went; "Oh is that a beer?" and while she was drinking it, he went; "Oh no no! That's my sex cup!" She spat out the fluids, which was meant to be cum.
"Hey, a milkshake!" "No man, don't drink that. That's my sex cup!"

"Oh no no! That's my sex cup!" "What's a sex cup?"
by sexycup123 August 30, 2009
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When you masturbate and orgasm into those cups you find at parties and events etc.
i Didn't wanna clean up any mess tonight so i used my sex cup
by Scottyraps August 20, 2009
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