Any container used to hold liquid (such as a glass, mug, or a cup), that could be potentially used to cum in, that has been cummed in, or is frequently cummed in.
Dude, don't leave your mug in the living room, Stefan'll use it as a cum cup
a girl that has sex with a lot of guys. hooker
1. You fucking cum cup. You fucked everyguy on the block..
2. Yo, that girl fucked the whole school.. She is a fucking cum cup.