1) A sink like, usually porcelein, object mounted against a wall with a knob to flush ontop. Only found in bathrooms for men. Occasionally you'll stumble across a new-age urinal that flushes when the motion sensor detects you aren't there.
2) The place to put a chocolate cake.
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1)
Girl: What the fuck is that?
Boy: Urinal. It keeps me from peeing on your face.
2)
Dude: Check out that urinal. Its so clean and new.
Dude Deux: ...You're right. Lets buy a chocolate cake and stuff it in there.
Urinal refers to a woman whose vagina sees so many different penises in a day that it can only be compared to a urinal at a stadium during a sports playoff season game.