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1.
brm
Gambling term, Bankroll Management. Usually refers to poker.

Proper bankroll management would be playing within your limits so you can withstand tough losses and bad beats. Unproper bankroll management would be putting a high percentage of your bankroll on the table at one time.
Sleightofjam used terrible brm and busted for the 543589543875th time this week after running up his original deposit.
by Hue Heffnot May 25, 2009
 
2.
brm
Short for 'Blackrock Mountain' used within WoW.
Alliance is ganking at BRM again.
by Halio September 26, 2005
 
3.
BRM
Short for 'Big Red Machine', this user is known for his extreme use of nonsense racism. Also listens to crap.
BRM calls people niggers.
by yeah July 18, 2003