Alpha Tau is known to be a shortening of the sorority Alpha Sigma Tau. Alpha Sigma Tau is one of the oldest national sororities in the USA. It was founded in 1899.
Are those girls in Alpha Tau? Yea, Alpha Tau or Alpha Sigma Tau. It's the same sorority.
by GillieTheKid February 5, 2017
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Hot, smart, hard ass mothafuckas who have cast iron stomachs and blue and gold rods. We drink everyone under the table (including people from LSU), keep high GPAs, and get the hottest women. All in all, if you're a mean motherfucker with a penchant for brotherhood and fun, be an ATO.

{Ruh Rah Rega}
Ashton's an Alpha Tau Omega member, and he's fly as a motherfucker.
by ATO89 March 27, 2008
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A national undergraduate college fraternity based upon leadership and character. Alpha Tau Omega builds character, ethics, and responsibility.

ATO consistently does community service events, fund raisers, and holds regional leadership conferences. Alpha Tau Omega is 100% haze free.

New chapters are required to be substance free, and the ATO national headquarters is in Indianapolis.
Man, I want want to rush Alpha Tau Omega!!!
by EtaPhi April 25, 2007
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A TRUE female frat boy. When you see XAT letters it means respect. Will thrown down harder then you, drink more then you, kick you ass in beer pong, or just kick you ass entirely while still being hot. Has an uncanny ability to party harder then anyone the previous night, wake up unphased, and somehow the next day ace a test. If you ever date one hold on to her: because you will have your best friend and girlfriend in one.
Guy 1: Oh man I just meet this awesome girl who killed me in pong. I don't know whether to hit on her or bring her to Guy's Night. Do you know who she is?

Guy 2: Probably a Chi Alpha Tau girl.
Guy 1: Oh man I just meet this awesome girl who killed me in pong. I don't know whether to hit on her or bring her to Guy's Night. Do you know who she is?

Guy 2: Probably a Chi Alpha Tau girl.
by naddaboo February 26, 2008
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A fraternity otherwise known as ATO, in which the members proceed to rape women and also destroy not only the property of their house, but also the property of surrounding houses
Screw Alpha Tau Omega,those damn ATO's raped another chick this weekend.
by snowman29 June 21, 2006
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A TRUE female frat boy. When you see XAT letters it means respect. Will thrown down harder then you, drink more then you, kick you ass in beer pong, or just kick you ass entirely while still being hot. Has an uncanny ability to party harder then anyone the previous night, wake up unphased, and somehow the next day ace a test. If you ever date one hold on to her: because you will have your best friend and girlfriend in one.
Guy 1: Oh man I just meet this awesome girl who killed me in pong. I don't know whether to hit on her or bring her to Guy's Night. Do you know who she is?

Guy 2: Probably a Chi Alpha Tau girl.
by naddaboo February 21, 2008
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Chi Alpha Tau is a local sorority with sisters that have your back any time of the day. They are a classy, down to earth group of young women that value academics and service. They love to volunteer their time for their philanthropies, The American Cancer Society and Mom's House of Lancaster. They also volunteer at dances for people with disabilities. True sisterhood is being a XAT girl. The bonds you develop in XAT is like no other sorority, it is true bond where friendship and love is developed. A bond so deep only a sister can understand.

They are bound by the motto: "Lasting Friendship and Service to others."

From the outside looking in you can never understand being a XAT girl, from the inside looking out you can never explain it.

Having friends and having sisters is two different things. When you get into a fight with a friend and you need their help they might not be there, when you get into a fight with your sister, it doesn't matter if its dead at night, they will drop anything for you.
Girl 1: Hey, who are those girls over there?

Girl 2: They are from Chi Alpha Tau, or XAT(pronounced CAT) girls.

Girl 1: Oh, a sorority? Ew doesn't that mean they are snobby?

Girl 2: No, these girls are different, they are real down to earth and accepting of others.

Girl 1: Hm maybe I'd like to meet them, I wouldn't mind being in a sorority like that.

Girl 2: Hey maybe we can check them out together!
by BelieveInLove February 8, 2010
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