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Dutch name - shortened from Sebastiaan. Loving, caring person with a great sense of humor.
Everyone should have a Bas.
by hannibunny December 27, 2009
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2
guy 1: Man, she's retarded as hell.
guy 2: B.A.S.
by mofo's crazy January 18, 2009
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3
Bitches. Aint. Shit.

A group of youthful teenagers who are known for their amazing ability at doing what they want, such as giving bitches purple dragons and fingering the po-po.
"whurrd you get your weed from?"
"bas."
"sickter."
by T April 01, 2005
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4
shortened from 'bastard'
"yir deid ya bas!"
by Snakeheid October 16, 2003
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5
"Burning anus syndrome." The feeling of a "ring fire" around the anus after a really bad diarrhea. Will cause the sufferer to walk bow legged for a couple of minutes. Symptoms can last for 5 to 10 minutes.
awww man i have BAS i shouldent have eaten all that cury.
by afrak August 06, 2008
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6
B.A.S. is the abbreviation for Big Arm Syndrome, a condition found in girls who are slightly overweight where their upper arms are huge compared to the rest of their body. The condition is common in girls who try to stay in shape but neglect their upper body. Often B.A.S. can be the result of a diet high in fat and above average consumption of alcohol. If it is not watched closely it can spread causing the girl to become extremely overweight.

Occasionally it is difficult to spot a girl with B.A.S. as a common side effect is having large breasts, which can be distracting.

Girls with B.A.S. are often over sensitive about their weight and this causes them to be combative and down right bitchy.

The Cure is to go to the gym and lift light weights that tone the bicep and tricep area of the arm. Along with a controlled diet of not eating like a cow, many girls have been able to escape the terrible syndrome and go on to be hot girls again.
"Hey man look at that babe over there with the big boobies"
"Ah I see, too bad she has a serious case of B.A.S."

"Oh that's a shame, she had a lot to work with, I hope she gets help soon, I'd hate to see her condition worsen."
by James Madison's Mentor January 22, 2012
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7
(aka Burning Asshole Syndrom)

The 'sickness' expierenced in the bathroom while depositing feces in your toilet the morning after eating several spicy things. Causes of this disease are things such as Buffalo Wild Wings' Blazin Sauce and Dave's Insanity Sauce.
"dude those wings last night caused me to have serious B.A.S. this morning"
by nstalgicnaysaer April 27, 2006
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