Refers to a girl's butt, that is rather large. Specifically relates to large butt cheeks and meaty area around the butthole. Interchangeable term with donk.
Her BHM was big and steaming hot, so I licked it.
Well a B.H.M. is usually a bald headed or really buzzed hair gangster looking person, says "foo" or "dawg" a lot. wears long plaid shorts and raiders,lakers,dodgers, shirts/jerseys. usually has a big fat head
speaking as a B.H.M.#1: " damn foo did you see those bitches over there?" B.H.M.#2: "hell yeah they're fine dawg." B.H.M. #1: " i know huh"
2. (adj.) A descriptor of an action which embodies a stereotypical African American action/event.
2. (adj.) I hooked up with a black guy last night, so BHM of me.