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Acronym for Middle Infield Butt Buddy. Or in Steve Ohms' case, acronym for Most Intellegent Baseball Buff!
Paul, you and Justin are such friggin mibbs!
by Joffrey Quentin July 31, 2008
Middle Infield Butt Buddy. Any two individuals who play shortstop and second base together. Or baseball in general.
Paul called Bryan and Brett MIBBs for always touching each other in the middle infield. He felt really boss afterwards
by ginger kid12324 August 13, 2008