Someone who is in a sexual activity with another person without being in a full relationship. It isn't romantic and can be both straight and gay. During the intercourse the word "BONE" is commonly used to show excitement.
"Hey do you know Sam?" "Yeah he's my bone bro". "Woah nice" "BONE"
"Matthew, will you be my bone bro?" "*baby gurgles and laughs*" "HEHEHEHEHE BONE BONE BONE"
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When you get your booty call to score you something you need.
She wanted to come over and bang but I was out of weed so I made her bring some, quid bone bro.
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