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1.
Muscle of the anal opening. Can be easily ruptured through violent anal sex.
Sorry if my 12-incher tore your o ring.
by MegaMan_C_ February 09, 2004
 
2.
The seal around a person anus.
She road the bone rollercoaster so much her o rings are blown. Causing skid marks in her panties.
by kagent November 23, 2005
 
3.
commonly used slang referring to the sphincter.
"dude, that fart was so vicious, i think i blew out my o-ring."
by ryan ingersol March 07, 2005
 
4.
Anal muscles.
1. My O-ring is a virgin.
2. If you don't slow down, you'll blow my O-ring!
by The nazi of Yatzee November 07, 2002
 
5.
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 !"
by Jake March 06, 2004
 
6.
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
by longhairedwizardwithlazyeye August 25, 2008
 
7.
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"
by JON MASSIE December 05, 2009