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AIS simply stands for ass in seat. Word can be used when you set an exact time or something and you let the person know AIS or else.
Mike's father told him and his younger brother at 5:30am they better he AIS or they will get left.
by Barbie March 29, 2005
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It's an abbreviation for "Ass In Seat" or else. It started from the sitcom "Everybody Loves Raymond" where Ray tried to pull it on Debra, but he was inept to know that you never pull an AIS on your own wife, but on the kids, just to teach them a lesson about being on time. It is usually said when you want your passengers in the car, so you can drive at the right time.
Ross: Alright Mon, for the party tomorrow we're doing an AIS or else at 5:00 p.m.
Monica: Alright, agreed, AIS or else at 5 pm.
by iLoveAss May 24, 2009
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Pronounced ASH!
see also - aislinn
or Aisy..the cuter version of Ais

a witty and sarcastic lady, who enjoys waving and has a serious tea obsession.
by Yablinn April 15, 2005
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This is usually stated when a college professor is so easy that all you have to do is literally have your "ass in seat" to achieve an A grade for the class. College students generally know which professors are AIS by word of mouth rumors.
Chandler: Hey Joey, take a community college course with Professor Ross, and you are guaranteed an A grade for the class as long as you attend class.
Joey: Are you saying Ross is an AIS professor?
Chandler: I am totally saying he's an AIS professor.
by communityCOLLEGEisEASY May 29, 2009
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An Ipswich Town fan whose hobbies include, window licking, ear chasing and being a cock 24/7.
by Norwich City fan November 22, 2004
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Someone who is half aisian. Also known as halfies, or sans. Pronounced (Ay-sh).
Tyler is 1.5 times better at math than Lee, because Lee is ais and Tyler is full on.
by soycow November 18, 2009
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Abreviation for asian invasion style. Used when infiltrating or rushing a given area installation or group of people.
by Spectre01 March 16, 2005
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