A mentally incapable individual who has the mental capacity of a fetus. A fetus boy can usually be found listening to Lil' Wayne or young thug. Fetus boys usually assume that they are hard motherfuckers, but if confronted, they will assume the fetal position and cry like a fuck boy supreme.
*MAN NUMBER ONE:"Bruh look at that nigga wit da dreads over there! He think he all hard and shit bumpin chief keef thru his 89' monte carlo! WHAT A FETUS BOY haha"
*MAN NUMBER TWO: "Well, atleast he ain't a cunt badger."
*MAN NUMBER TWO: "Well, atleast he ain't a cunt badger."
by Demented805 October 1, 2014
A young male who seeks out older men to give them head in public places and then continues to say that he has a sex life. Acts like a tough guy and says stuff like "Ill kick yo ass pussy" even though they are often too small to do so, hence the "fetus" part. They usually grow out of it and eventually become an ok person.
Nathan: What the fuck!? Jimmy?!?
Jimmy: Oh shit Nathan what the fuck!?!?
Nathan: Are you sucking off my grandpa?!?!
Jimmy: I can explain!
Nathan: Imma record this shit bruh. You a cock sucking fetus boy.
Jimmy: Oh shit Nathan what the fuck!?!?
Nathan: Are you sucking off my grandpa?!?!
Jimmy: I can explain!
Nathan: Imma record this shit bruh. You a cock sucking fetus boy.
by IIIIEFIUOHEOWIUFHJAIL June 10, 2020