When it is impossible to distinguish where an obese person's back fat ends and their ass begins. Combination of the words "back" and "ass".
Nacho: Hey, that new guy William Jones that started yesterday, is one fat motherfucker.

Gabe: Fuck yeah, he's so fat that he don't just have ass, he's got bass.
by Gabriel D. Sanchez May 22, 2009

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A portmanteau of the words "Bad" and "Ass", pronounced like you would the instrument, not the fish. This word can just be used as a replacement for saying "Bad-Ass", so that it comes out quicker, and is not construed as being socially impolite.
"Dude, Batman is such a BAMF."
"Yeah dude, The Dark Knight was a friggin' bass movie."
by mr hat n clogs September 08, 2008

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from the latin words "bad" and "ass" meaning "bad-ass".
That guy is one bass mother fucker!
by Daniel Andrews August 15, 2007

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The purest form of Speed (Amphetamine) in a thick paste.
Often taken in very small doses… For example pin-head size keeps average person buzzing for approx 12 hours.
I'm totally addicted to bass
Wow woah ho
Totally addicted to bass
Wow woah ho
( Puretone - Addicted to Bass )
by ChRiS February 17, 2005

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The area between your balls and your ass
Lick my sweaty bass.
by Architeuthidae September 22, 2011

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The area between your ass and your balls
how big is your bass?
by wldntyouliketooknoww May 19, 2011

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the thumping in a girls clit, when they are really turned on.
When Chase rubbed me, dat bass was thumpin girllll!
by pussy_killer June 01, 2009

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

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