MB

morning bulge; when you wake up and notice that your dick is poking your pants, thus forming a bulge

I don't get embarssed when my mom notices my MB coz its only natural and happens to all teenage boys

by tory borty May 8, 2013

MB

A short term for Money Boy which is basically similar to Working Girl but it’s a boy

He is a quite famous MB

by The_holy_avocado:)) March 5, 2019

MB

My Brudda or My Bredrin

Haps baps MB and ML= Happy Birthday my brudda/my bredrin , more life!

by MrStealUrDefinitions;) December 18, 2019

MB

Make-believe.

Fights in real life don't work like they do in movies, it's all MB.

by bitstripslang October 11, 2019

MB

stands for Major Bitch

olivia: omg you're such a slut cassidy
cassidy: ugh you're such an mb

by socksandsandals25 May 13, 2016

mb

Mage Bank in RuneScape. People say they're mb pk'ing when they are player killing in the wilderness at the mage bank.

OMG! I just owned a noob for whip at mb!

by Gre8est_Sk8r December 10, 2008

MB

an underage love interest, usually one that's lonely, anti-social, and desprate.

Dood, you call that MB up today?

Nah man, she's total jail bait.

Yeah, but you know she gives it up!!

by dood11 December 26, 2007