Top definition
Prior to ejaculating, the male will insert his penis into his sexual partners belly button. Upon ejaculating the sperm will fill the belly button 'foaming' out of the seal made by the penis and belly button.
Bro! I totally keg capped that chick last night.

Or
Babe just let me keg cap you!
by Heykiddo100 July 16, 2013
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