(v.) To turn around in one's attitude and actions.

(v.) When snowboarding, skating, bmxing or similar, a 180 is turning the medium around quickly.

Both definitions are from 180 degrees, a half-turn.
A) He did a complete 180 after the Germans attacked.

B) He pulled off a 180.
by Kung-Fu Jesus May 7, 2004
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n. a level 4 maximum security design prison in California, as distinguished from a level 4-- 270. The cell block, or building, is divided into three sections, with a central control tower, giving the correctional officer a 180 degree view of All sections in the building, and affording no blind spots in which an inmate might commit an act of violence. All SHU (security housing unit) buildings, and typically all SHU kick out yards, are 180 design.
I did my whole T-number on the 180.

After I did that stabbing, the committee gave me 16 points, now I have level 4 points, and my gang enhancement and SHU terms qualify me for the 180.

I've got 180 points. (adjectival use)

That fool ain't no reg, he's a poo-butt--ain't never even been on the 180.
by The Mad Grammarian December 19, 2017
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Used alot in skiing and snow boarding. Spinning 180 degrees, to face the opposite way.
"Dude, I Pulled a smooth 180 off that jump"
by Snips July 29, 2003
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High-IQ woman from Yale, or some other "good" school, who's also a ho 'tween the sheets.
Barbie Doll, a 180 honey in sling-back kicks and a spray-on Armani, walks in the bar, hip-checks the bouncer . . . heads don't just turn, they whiplash. . . .
by William Dean A. Garner August 29, 2003
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When you go through a personality change caused from getting too close with someone. You can get so attached with someone beyond comprehensible that you cut them off completely. Sometimes you can cut them off to avoid attachment instead
The NugThugs sometimes get so close in the group chat that they 180 each other.
by nanicakexxxx June 16, 2014
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When a girl has an ass so big it appears to be 180°(half-circle)
Yo did you see her ass it was a total 180
by NiggaDownTheBlock October 13, 2016
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The action of pivoting at a 180 degree angle (i.e. turning around) when a male is performing #1 at the toilet bowl but then realizes that he also has to do #2.

This typically does not apply to Urinals or to females (unless the female likes doing #1 standing up)
Although he thought it would be a quick trip to the bathroom, Billy realized he should do a 180 before his long commute.
by That's My Q November 10, 2010
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