by playap02 January 16, 2004

On gothic jewelry, such as bondage cuffs and collars, the O-ring is the round ring (as opposed to the D-shaped D-ring). It signifies sexual submissiveness.
If a guy sees me in my red collar with the O-ring, he will know without speaking to me what I like ;-)
by Ms. M September 6, 2003

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"
friend - "WTF? that sounds like theresa, but what's happening to her?"
you - "oh, that's theresa's o ring"
by JON MASSIE December 5, 2009

by Ooogalie Boogalie May 22, 2003

the black plastic rings used as backings for thicker gauge jewlry (usually plugs) worn by those with stretched ears.
by Marsalis December 23, 2005

by SR August 1, 2003
