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1.
180
(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 07, 2004
 
2.
180
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 28, 2003
 
3.
180
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
 
4.
180
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 28, 2003
 
5.
180
A Match.com phenomena that commences with the cyber stalking the pretty person, followed by an e-mail to him or her telling them how terrific and interesting he/she seems, followed by pure hatred of the pretty person when he/she doesn't respond.
Jamaal: "Hey nigga, did Shaniqua_4507 get back to you?"
Rayshard: "Who?"
Jamaal: "You know, dat bitch you said was da one fo you."
Rayshard: "That bitch? She has a small ass anyway."
Jamaal: "Sounds like a Match.com 180 to me. I tole you never git on dat thang."
by ChumleyTWalrus December 04, 2010
 
6.
180
1. A time period in which someone is placed in segregation (DSU, The Hole) for a long amount of time. 180's are given for major offenses. It equates to 6 months, and is usually followed by a year in IMU.

Other common sentences are 90 & 120.
Did you hear that Spooky got a 180 for beating that guys head in on the yard a few weeks back?
by NotYourAvgWhiteGirl March 15, 2009
 
7.
180
In darts, the greatest number of points that can be scored in one turn, achieved by hitting the triple 20 on all three throws. Also called a ton 80.
A perfect game of darts: 501-180-180-(3*20+3*19+2*12)=0
by 0matrix April 26, 2008