A Buddy Boner is an erection that a man gets while hanging out with his male friends. It doesn't mean that he's gay; it just means that he's having a good time.
When Bill and Mark played poker together they each developed buddy boners. Man, were they ever having a good time.
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.
A considerate dude who frequently/diligently tidies/smoothes/re-adjusts the blankets/pillows while canoodling in bed with you, just as the well-known feathered grass-walled-nest dweller does to please a female who drops in to visit.
Tiffanyalways appreciates my being a bower-bird bed-buddy, since it feels so much more pleasant to sleep with me if the blankets are always neat and uniformly covering us, especially during the cooler seasons.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."