Top Definition
Muscle of the anal opening. Can be easily ruptured through violent anal sex.
Sorry if my 12-incher tore your o ring.
โดย MegaMan_C_ 09 กุมภาพันธ์ 2004

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The seal around a person anus.
She road the bone rollercoaster so much her o rings are blown. Causing skid marks in her panties.
โดย kagent 23 พฤศจิกายน 2005

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Anal muscles.
1. My O-ring is a virgin.
2. If you don't slow down, you'll blow my O-ring!
โดย The nazi of Yatzee 07 พฤศจิกายน 2002

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a round seal, often made of neoprene or some other compressible "rubber-like" compound, that is an industrial part.Looks like the part of a condom that unrolls before you actually unroll it. Can be used as a cock ringif you get the right size
"My buddy's a mechanic, I went thru his box of assorted O rings and found the size I can use as a cock ring. Nancii's gonna beg for mercy tonite !"
โดย Jake 06 มีนาคม 2004

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your brown eye, bunghole, or the muscle that holds your turtle head in.
dude i just took a massive dookie, i almost blew my o ring
โดย longhairedwizardwithlazyeye 25 สิงหาคม 2008

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use your phone to record a girl orgasming while you're having sex with her, then set that recording as her personal ringtone when she calls you.
<your phone rings>
friend - "WTF? that sounds like theresa, but what's happening to her?"
you - "oh, that's theresa's o ring"
โดย JON MASSIE 05 ธันวาคม 2009

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1. (slang) sphincter
2. (normal) a rubbery gasket used to seal a connection between two pipes. The o-ring is squished between two flanges, forming an air-tight seal.
Don't push too hard or you'll bust your o-ring.
โดย Khashishi 20 เมษายน 2010

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