Top Definition
A guy who can fill in for you when your girl wants to have sex and, for whatever reason, you are unable to handle the deed. A guy who will loan you his bone so your chick doesn't trip, and then will leave when the job is done.
Girl: What's wrong baby?

Boy: I don't know...i guess i'm tired or something.

Girl: Should I send dude a text and see what he is doing right now? Maybe he has a loaner boner I can use tonight?
by hoo dat October 09, 2011

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