Top Definition
When vast amounts of semen are excreted from the head of the penis.
Phyllis: Gurrrl, why yo eyes so messed up?

Brittany: I didn't realize Billy Bob cums so much; it was like a cum hydrant!

Phyllis: Oh! I've made that mistake before.
by Dr. Purple Cock February 05, 2014
8 Words related to Cum Hydrant

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