MSB

short for 'Massive Sperm Buildup' - usually occours in young male adults under 25 as a result of no sexual activity for more than a week or 2

Derek had not masturbated for about 3 weeks and was suffering from a severe case of MSB, but after watching 5 minutes of crazy cumshots #4 he had a massive sperm bomb and had to use his blue bandanna to clean up!

by Cam Bomb April 25, 2012

MSB

A person with an extremely huge mullet who constantly wears sweatpants and snowboots in public places.

Big Dan is the biggest "MSB" in the whole world.

by One Eyed Jack March 7, 2004

Moonlit Silent Basketball (MSB)

The first sport for stoners. You have to be high to enjoy this game. You and your buddies try to play basketball while making as little noise as possible, and the moon must be visible above your heads.

I'm blazed right now dude, lets go play some Moonlit Silent Basketball (MSB)!

by Guitarpwnage93 February 10, 2009

Msb

My meaning of Masturbate for discord.

“Msb count:4”

by Nugget😚 September 4, 2022

MSB

Microphone sucks balls

Colleague: Yo, I can barely hear you..it sounds like you're driving?
Me: MSB

by Kidius February 11, 2022

MSB

Massive sperm build-up, when you haven't ejaculated in a long time

I'm walking funny because I have MSB

by The Tinman October 3, 2017

msb

"my sweet boy"

"msb" is often used by girls or women who is referring to a loved one or speacial person who is a boy/man.

"Gm, msb" (Good morning, my sweet boy)

by debby defines December 13, 2024