Behemoth Share definition Flag Behemoth is a term used to describe a girl who looks like she's been nailed by 1000 black men. "that girl had a huge behemoth between her legs, it was worse than a sasquatch and a mott" Behemoth by LongJ0n August 11, 2008 0 0 Get merch Get the Behemoth mug. Buy Now — $32.95 See more merch