Top definition
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."
by Demented805 October 01, 2014
Get the mug
Get a Fetus Boy mug for your daughter Nathalie.