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Abbreviation for friend with benefits. Someone who you can hook up with, have sex with, etc. with out the attachment of a relationship. Someone who is there for you to make out with whenever desired.
"I saw you go upstairs with him last night, you hooked up with him didn't you?"

"Yeah, but that's it."

"Are you two dating or not?"

"No, we're just benfriends."
by cdxcore January 10, 2009