This word has multiple meanings. I see that the musical instrument part and fish part are well written already, so I'll skip these two and define it according to Meghan Trainor's songs:
Bass, in contrary to treble, refers to women that are not model-thin, and has confident in their body shape; they don't try to lose weight unhealthily, or feel sorry for themselves for not being 'fit' to society's trending standards.
(Lyrics quote) You know I won't be no stick-figure silicone barbie doll, so if that's what you're into then go 'head and move along...because you know I'm all about that bass, no treble.
(Lyrics quote)I smell her on your collar...I gave you bass, you gave me sweet talk...Tell me do you think I'm dumb?
by Evergreen712 January 20, 2015

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A contraction for the phrase 'badass'.
You try playing Rez yet? It's frickin' b'ass.
by TiTanTHPS December 31, 2009

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Something that is droped. Hard.
That bass dropped harder than a nuke in WW2
by Blaze42264 November 13, 2016

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An abreviation for badass.
"Whoa, the Amazing Spiderman is totally bass!"

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Bitches Are So Shady! This means that if your a female you cant help but to be shady to men....... In one way shape or form all Bitches Are So Shady!
You know that one bitch that my nigga likes well she is the B.A.S.S. Master!!!!
by That Boy Matt Smith April 14, 2006

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a big butt
Meagan trainor loves bass
by cca6 March 29, 2015

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The part of your body between your BALLS and your ASS. Derived by combining Balls + Ass = Bass. A.K.A. "Gooch", "Chode".
1. Before that chick gave me head, she went down and licked my BASS royally!
2. Went camping all weekend, and haven't showered yet...Boy, my BASS is extra ripe, containing a funk of a thousand smells!
by Butt Boy 75 October 19, 2008

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