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1 definition by SumTingWong

After participating in a sexual activity of any kind, you cum into a bellybutton, with a piercing, of an individual (or your own) and allow the cum to dry and harden on the piercing.
I heard Jason gave his girlfriend a Jizz Belly.
Yeah she`s been showing it off all day.
by SumTingWong January 11, 2010