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
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
from the latin words "bad" and "ass" meaning "bad-ass".
That guy is one bass mother fucker!
by Daniel Andrews August 15, 2007
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
The area between your balls and your ass
Lick my sweaty bass.
by Architeuthidae September 22, 2011
AN ASS THAT IS SO LARGE THAT THE SHEER MASS OF IT CREEPS UP ONES BACK BECAUSE THERE IS NO MORE ROOM FOR IT TO EXPAND.
DAMN! LOOK AT THAT GIRL R.M. SHE GOT A SERIOUS BASS BEHIND HER!
by ERNIENBERT August 14, 2008
The cause of many earthquakes and car accidents, a ghetto blaster (way of saying something is loud and ghetto), a way of saying cool
"The cause of the car accident was bass."
"Dude, that sterrio is so bass! You can hear it in Phily!"
"That gun is so bass."
"I'm so bass."
by EL AGUA October 14, 2007

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