When a man overly obsesses with the stomach of a pregnant woman. This usually includes rubbing hand and face on her stomach, occasionally stopping to sniff.
Hey Amanda, why are you crying!
Your damn roommate keeps asking to feel up my unborn baby! He's a Fetus Cletus!
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What you would call a fetus that is the result of a "Chut N Nut".
Person 1: I bet that baby that Jesse's sister is having is a cletus fetus.
Person 2: Are you saying that Jesse and his sister Chut N' Nutted?