Top Definition
mbsob is a motor boating son of a bitch
tank : yo guess what i did last night ?

darkness : what ?!

tank: brrrrrrbrbrbrbrbrbrbr (shakes head left to right pretendint to hold tits infront of his face )

darkness : you mbsob

felix :repinga
by tank_s13 December 08, 2009
9 Words related to mbsob
The act of motor boating a woman with some big ass titties, i mean high C's or up.
Dam tank when you handled BTB that made you an MBSOB.
by fonix36 December 08, 2009

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