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1.
A romantic interest that one has while one is involved in another relationship. A new relationship to jump into at the end of the previous one, and possibly even the reason to break up with an old partner. Can also be used as a verb.
My God, Tess has the hots for Dennis and she's already going out with Marly. Looks like he's her prebound.

Tess just broke up with Marly, and she's going out with Dennis. Looks like she prebounded.
by maianess January 15, 2007
 
2.
An extended romantic or sexual hookup that bides the time until a more serious relationship develops with another person.
"He's not my boyfriend, he's my prebound."
by DJ 007 March 25, 2006
 
3.
Similar to a rebound, but occurs before the relationship has actually ended.
"Dude, I don't just want to be a rebound"

"Don't worry man, you started doing stuff before she got dumped, it's totally a prebound"
by John9329 December 02, 2007
 
4.
The term given to an ex girlfriend/boyfriend that you thought was serious until someone better comes along that is actually worth your time.
Lauren: "Jill, you just got over a relationship and are now dating someone new? You are totally Rebounding!"

Jill: "Umm no.. my ex was a total prebound. I needed it to figure out what it is I REALLY want in a relationship. Just to pass the time. The one im dating right now is much more serious and waaay better!"
by bbAsh August 26, 2008