Bone-bud 

Not to be confused with the literal and anatomical definition of 'bone'.

The term stems from the use of 'bone' as synonymous to the action of 'hooking-up' or 'having sex'. Thus a 'bone-bud' is someone you are currently hooking-up with, and is a term synonymous to a 'friend with benefits'.

Hey, did you hear about those two? Since that party last weekend, they're now bone-buds.

Bone-bud by mmm_k June 14, 2017

Bone Buddy 

In essence, the same as a "fuck buddy" or "friend with benefits".

I think we can all agree that the alliteration in "bone buddy" creates a far nicer ring than the two aforementioned examples, and thus it should become the commonly used term.

Blair's bone buddy is out of town, so he will keep you company tonight.

Bone Buddy by devedvic08 January 7, 2008