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1.
ETO
An abbriviation for the European Theatre of Operations, which was part of World War II.
That veteran over there fought as a mortarman in the ETO during Word War II.
by Operation Detachment July 26, 2010
7 1
 
2.
Estimated Time Of Sleep
1: Hey man, what homework do you have to do tonight?
2: FUCKFUCKFUCK I HAVE TO DO MY ENGLISH PAPER!!
1: Etos?
2: 5 am, fuck my life.
by Oliver Li April 03, 2008
7 2
 
3.
Estimated Time of Sleep. Used to indicate when you're planning on going to sleep.
Friend 1: I've got a bunch of homework. ETOS is 1 am. What's yours?
Friend 2: RIGHT NOW! No homework for me!
by DaHacker12 November 01, 2011
2 0
 
4.
Anywhere east of I-35 in Austin, TX, in the five and a half (512 area code). In other words, east Austin, which, of course, is markedly less civilized and affluent than the western half. A good place to get jacked up - as well as str8 up got. Don't drive into this area in a phat ride with heavily tinted glass and gold rims, or some cholo might take a guage to your driver's side window - even at a stop-light.
"Biiiiiiiitch, we're ballin' thru E-to in this bitch-ass Impala we jacked, and nobody gives a shit! Whatuuuuuuuup?!?!"
by Shaf September 15, 2004
2 0
 
5.
ETO
Estimated Time of Online-ness
Shit, your website went down, any ETO?

When's the ETO?
by Danny S November 25, 2005
10 24