mrb

Mega Raging Boner, referring to yourself

Well i have a MRG baby!

by Manny Fresh July 08, 2005

MRB

Stands for: Men-Are-Bastards

A mindset in which a female or male temporarily or permantely believes that all members of the male gender are bastards, often due to a viscious break-up or negative relationship.

Jen was cheated on so now she's in a MRB mindset.

by CheeseCookies September 11, 2009

MRB

Acronym for "mad random boner" -archaic, inf. Circa early 2000s

Greg would have been on time for his next class, but he got an MRB at the end Home econ, and had to stay seated for a few minutes to conceal it while it went down

by Dang8701 September 28, 2021

MRB

MRB, A Term used in multiplayer games, Usually GMod Roleplay Servers, Means "Mass Rule Break".
Its Self-Explanatory, Mass Rule Break is when you break more than 2-3 Rules.

A: Dude, can this guy get banned, this is MRB At this point!
B: No admins on duty, Its joever.

by chipzeydude242 August 27, 2025