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1.
wen an erection occurs whilst a penis is inside the body/tummy, usually caused by a baby who was a fetus in fetu that grows up with the "fetu" (or baby inside the baby) still inside their body. if the fetu is a boy it can still get an erection if the grown body is arroused causing a "penummy" (or penis tummy)
linda:"oh my god jenny! what's that sticking out of your tummy?"

jenny: "oh that's just my penummy."
by .SceneKid.GhettoStar. August 17, 2007
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Words related to Penummy:

lo l rofl penis sex tummy