bsa
British Small Arms,
discontinued motorcycle manufacturer of western Europe in 50's and 60's
My BSA ran over your Indian
by Poster Nutbag June 23, 2003

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Top Definition
bsa
Boy Scouts Of America The only real Definition for thos three letters. Take note Business Software Alliance.
I a DE and I work for the BSA.
by Blackdog45 June 11, 2005

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bsa
beat some ass; said when necessary
Girl 1: Hey she said you suck too much dick, and you should lose some weight.
Girl 2: Legit? Oh, hell no. Hold my earrings, you know I'm bouta bsa.
Girl 1: You go girl.
by batmannnnnnnnnn March 02, 2011

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An abreviation of Buenos Aires, Argentina.
Yo Amo BsAs
I love BsAs
by Lalalala000 February 10, 2009

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BSA
BSA = burning swamp ass - a condition common in Kansas City, Missouri, whereby a person drinks copious amounts of Boulevard beer (which has an unknown secret ass-leak ingredient) and eats fiery hot wings from The Peanut. The next day after taking a healthy dump, burning swamp ass ensues and said person has to wipe their fiery hole on 15 minutes intervals for 2 hours after.
The beer and wings were great, Rob, but I've got BSA so bad it's making me sweat and tremble. Can you smell it, or should I show you the tracks on my skivvies.
by Ramrod 69 March 18, 2006

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BSA
Balls Slapping Ass....what else could it be?
I love BSA in the morning! Or afternoon....whenever!
by skeeebs April 05, 2015

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B.lunt S.ide A.ssistance

this refers to when you have rolled the inner leaf of a blunt and require another individual to put pressure on the end of the outer leaf for more accurate tightness control.
i.e. "Can i get some B.S.A.? this L is fat as fuck!"
by Blunt Masta Flex August 30, 2010

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