msb 

Mushroom Shaped Bruise

A bruise left after being brutally slapped with a penis.

Sir, u are worthy of an msb or 2.

msb by Aurarier November 29, 2004

MSB 

The home to a whole bunch of people.

Including myself, since someone forgot.

MSB by Dante Reborn February 14, 2004

MSB 

This is the definition reffered to by me under ZSB. The sharer of the abrreviation "MSB." Secluded from the rest of GameFAQs (Due to a link axe)

NOTE: The Mario Social Board is actually the Mario Games Social Board... However, MGSB is taken by the Metal Gear Social Board... >_<

Rangnarok0387, VenomFang3001, lexichanw00t, Black Abyss/The Black Wanderer, Blaze12, DaChampion/The Almight Smithy/Mind/Rethink/Champ, Koran Rag, IceBlade, MechaShadow, CMDR Reservoir, NeonDragon9000, ResidentEvilMaster, and deku stick puppet are all vets.

MSB by Kakashi 11235 December 30, 2003

MSB 

The Mario Social Board of GameFaqs. It's home to users like Linking12, Sunny the Armadillo, Gleaso, Marono, Blinkandcandy, Mario99, Flamecube, Icemonkeypro, Hermitua, Darkfusion, Gigagigagigabowser, Fastfido, Pheduik, BRJ, ZB3000, Crocomire, and many many others.

Did you hear that the MSB is gonna survive?

MSB by Sunny the Armadillo December 29, 2003

MSB 

Mental Sex Break

<text message> Hey Sexy, This is your daily MSB...<explicit ideas imagined>

MSB by bsd2424 September 19, 2009

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!

MSB by Cam Bomb April 25, 2012

msb 

nah!! my definition of msb is 2 cool to b on the 'net sorry!

she's a total msb!!

msb by denisse June 14, 2004