look up any word, like ethered:
When a guy breaks up with one of his girls and moves away, but comes back and has anal sex with her in the back door...by which I mean her ass.

Poonerang is a portmanteau word created by fusing poon with boomerang.
"Remember Karen? Well, I totally got some of that poonerang off of her when I went home for Thanksgiving."
by Sean Gray December 27, 2005
A girl you can toss away, who always comes back... for sex. Often a girl who leaves town but comes back once in a while to visit.
Deb went back east to go to college; I didn't want her for a girlfriend anyway, but I'll let her be my poonerang.
by swineflew February 21, 2011