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1.
Biv
In a gay relationship, a Biv is the one in the relationship who would take the bottom half in bed. Taken from the ROY G BIV acronym used when describing rainbows.
Lorne is totally the Biv in that relationship. He's so fem, you know Skyler rides that nightly.
by Skatchmo January 16, 2009
 
2.
biv
when people are in the water they say biv if there is a booger in view
hey buddy, you got a biv hanging loose!
by markkie June 01, 2003
 
3.
biv
A shortened name or code word for a vibrator. Used when you do not want anyone to know that you plan to use a vibrator on or with your partner, be it male or female. Derived by taking the first 3 letters, V, I and B an flipping them around.
Hey Marcy, whip out Biv right now and lets ding.
by Chupa March 29, 2005