Refers to either someone with an unusually large ass or the ass itself. Saying made popular by the character 'Frank Rizzo' as played by Johnny Brennan of the comedy team, 'The Jerky Boys'.
Example 1

Guy 1: Dude, look at that girl's ass!
Guy 2: Wow, she has a barrel ass!

Exampe 2

Guy 1: Damn, that girl is fat!
Guy 2: Yeah, she's a barrel ass!
by Jake Brasco April 9, 2008
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Much like barrel, a barrel ass is a woman who has a massive ass, which resembles a barrel.

Different from a ghetto booty, as there is nothing good about a woman who is considered to be a barrel ass
I cant BELIEVE you hooked up with that barrel ass last night, bitch had to turn sideways to walk out the door!
by friarsams May 2, 2005
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Going ridiculously fast, preferably down hill.
So i was on my sled, right, and i was barrel-assing down the hill...

or

Woah.. did you see that Viper go barrel-assing past us?
by Goldphishe August 24, 2004
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The act of driving very fast on a road or highway or street. Can also be applied to the act of pursuing a personal or professional goal. Originated in the 1960's, originally used in Brooklyn NY, describing a return trip from the Catskills in Upstate NY.
"I had to be back to light the boiler at the plant, so here I am barrel assing down the highway right past a cop." "He is determined, I mean he's barrel assing toward his goals."
by Charlie 1970 to Joey The Kid December 18, 2011
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we was walkin' down the hall and Clyde here ripped a double-barreled-ass-blaster and I swear you could see the paint melt off the wall.
Also:
a fart so strong, it will make a skunk's eyes water.
by GreenEyedMadman August 24, 2005
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