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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
mugGet the MSBmug.

E/S Mad Swan Bloods (MSB)

Also known as Byrd Gang (VSOP), one of the most active Blood sets on the East Side. Main cliques: 77th, 79th, 80th, and 84th. Allied with IFGB & CPFGB. Longstanding beefs with ECC, 73GC (an eastside gang), and 73HC (also an eastside gang) — some of the deadliest in L.A. history.
“Aye blood, them E/S Mad Swan Bloods (MSB) don’t play on bloods! — if it’s up, it’s stuck.”—LA locals
by RealTalkOnlyFool October 12, 2025
mugGet the E/S Mad Swan Bloods (MSB)mug.

MSB

The term "MSB" means MumSBrain, similar to mumslife it's used to signify that you aren't lying about something.
'Yo bro have you seen that girl with the fat ass'
'MSB i saw it, it was hugee'
'MSB it was huge and juicy'
by blackthugshaker123 September 3, 2025
mugGet the MSBmug.

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