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Acronym for the adjectival phrase; "(the) Most Ballin' Shit Eva'"
MBSE is the superlative form of hella tight.

Origin: Dave Chappelle Show.
You're flying in outer space with Thom Yorke? MBSE!
MBSE by Andizzle Invisible September 18, 2008
Related Words
Acronym for the adjectival phrase "(the) most ballin' shit eva"
Dude, that party last night was MBSE!
MBSE by brdy_ September 18, 2008