1)The act of engaging in vaginal sexual intercourse with an already impregnated woman.

2)Getting your penis all up in that fetus.

3)Poking a baby in the face (with your penis, of course).
John: Yo, Alex did you plow Tiffany last night?

Alex: Hell yah John you know it!

John: Dude, she's four months pregnant with Tim's baby. You got that fetus penis!!!

Alex: Shutup man.

John: Alright, alright............. Fetus penis.

Fetus penis: That shit your daddy probably resorted to.
by The Bananna February 18, 2011
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The only penis smaller than a baby penis
Oh it wasn’t a baby dick Rebecca…it was a fetus penis
by MuzzikA0 March 29, 2022
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What comes out when you pass a kidney stone.
Honey, I think I just passed a Penis Fetus! I feel so much better now.
by Joyful Journey July 2, 2023
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