have a bone

to be infatuated with a girl

Man I have a bone for this girl, I want to hook up with her.

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have a ring

More intense than having a bone for a girl, having a ring is the position of being so infatuated that you would marry a girl if he is given a chance

Dude, my roomate would totally have a ring for this chick at school, like damn, he was on knee.