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ONS is an acronym indicating the common dating phenomenon One Night Stand. You can use the acronym ONS to indicate a person with whom you have had said One Night Stand.
You: "Uh-oh, guess who just walked in?"
Me: "Shit. Who?!"
You: "ONS"
Me: "Great... and I thought I'd never have to see him again."
by Roberta Pincer April 11, 2005
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ONS simply means one night stand.

Usually used by the male population.
Yeah me and that girl had a ons lastnight, she was awesome.
by ANT81 August 25, 2005
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This stands for "One-Night-Stand" and is used by some males to inform thier friends what they think of certain women in the club.
Check her out!! She is definately an ONS I wouldnt mind havin tonite!
by Shinshoryuken January 13, 2006
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Onslaught, a game mode in Unreal Tournament 2004 where players trying to capture nodes to eventually make way to the enemy base and try to destroy the power core.
It takes good team strats to win at ONS.
by CorporationX February 17, 2005
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