1. Bad manner. The opposite of GM, and most often used in reference to online gamers. Generally refers to someone who is acting like a dipshit, or cheating.

2. Black mage. A lovable psycopathic killer who stars in 8-bit-theater.
1. Don't play with him, he's a BM maphacker.

2. The only reason BM kills children and lets their parents live, is to be excesively cruel.
by bonekill January 7, 2005
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(Bee Em) An abbreviated form of BMW, "BM" is urban vernacular for a BMW automobile. Ask someone from the hood - they'll tell you.

Since 1990 or earlier, all the way up to the present, the term "BM" has been frequently used in rap music lyrics - some you've heard - to refer to a BMW.

This is not the first post to proffer this definition of "BM" but those posts are buried under stupid definitions. Voters, do you know what "Urban" means? Have you looked up the word, Urban on, say, Urban Dictionary? But didn't you come here because you already know the definition of urban but you don't know what nine piece means?

I can at least understand how "bad manners" is the top definition - cuz korean invasion.. you guys have won this won - hangug-ui widaehan seuseungnim, jinsim-eulo seunglileul chughahabnida!

But bowel movement? I'm pretty no one on any corner has ever uttered the words, "bowel movement". on ANY corner. ANY-WHERE. EV-ERRRR.

"Yo son, hold this heater, son. Gotta have a BM baaad, son. Real rap, son!" wait, no: "real crap, son!"

"Woa-day! - Come jose with me in the stall while I'm havin' this BM. You got a square?" "man, send it to the river!"

In the United States, use of the term "BM" (bee em) to refer to a BMW is generally limited to urban settings. Outside the hood, and certainly on Urban Dictionary, pretty much no one equates "BM" with BMW.

Pretty much everywhere else in the world, BM is the most common way to refer to a BMW.
"Now I lean in a cream BM
Listening to beats, sippin' premium gin"
from "Crush Linen." Lake - a.k.a. Lakey the Kid, Lake Entertainment Presents: The 41st Side, Lake (Entertainment), 2001

"I seen your girl post her BM
So I hit her in her DM"
from "Down in the DM." Yo Gotti, The Return, Collective Music Group, 2015

"Now I was pushing on my BM with no context
It wasn't BMW - it was BMX"
from "B Girls." Young N Restless, Something To Get You Hyped, Pandisc, 1990
by Crack Raider - Sharp December 7, 2019
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Bitch MoveBM
"EdgeLord69 getting 21 kills last round because he camped behind a pool table is an ultimate BM." "Sadra giving a speech about coffee pot use and then storming off before we could give feedback was a total bm." "Dude he just ran away when he saw we were filming him. What a bm."
by Brandonmical June 17, 2020
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I seen your girl post a BM, so I hit her in the DM.
by Triiss June 1, 2017
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Business Meeting - When you want to get out of the office with your closest co-workers for a few drinks at lunch and talk shit you hold a business meeting
Yo guys its 12:30...time for our BM. Lets bounce before we get seen. I need to be back by 2:00 for a conference call.
by LowABV December 29, 2021
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BM stands for "Black Morass Instance" in World of Warcraft Burning Crusade.
LFG BM, rep run or LF2M healer and tank for BM, pre Kara
by Manosomba September 11, 2007
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