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1.
EOW
End of Watch. A police term used in filing reports to signify the end of their shift.

Also commonly used to signify the date of when an officer was killed in the line of duty.
RIP, Sgt. John Doe. EOW: 4-13-2013
by JS Wright April 13, 2013
 
2.
EOW
at work it means END OF WEEK
Can I have those edits by EOW?
by The Der August 02, 2005
 
3.
Emergency Outdoor Warning System (aka tornado, tsunami, or nukes sirens)
The EOWS in Denver sounds for tornado warnings
by djscrizzle November 07, 2008
 
4.
(noun)
Acronym for established older woman; often spotted in bars trying to pass for women in their late 20's or early 30's. Often associated with or interchangeable with cougar or sugar momma.
guy 1: last night this E.O.W. was trying to pick me up at the club.

guy 2: doesn't she have kids or a business to be taking care of?
by Rumplstilskin6 May 16, 2010
 
5.
EOW
acronym for End of the Weak, an indie hip-hop company based in NYC with branches in UK, Germany, France & Spain.
www.endoftheweak.com

-Yo I copped this ill CD at the EOW show.
-Who's CD?
-Its an EOW CD, homie.. those cats kill it!
by Sted Ruckus December 06, 2006
 
6.
EOW
Often used in party situations. It generally means END OF THE WORLD
We are going to party like it's the EOW
by Miguel77 March 11, 2008