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1.
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 24, 2007
 
2.
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
 
3.
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