Baniyn (bahn-eye-n) is an acronym for "busted a nut in your name". It's a shout-out, or a dedication to a person of which whom you've masturbated and ejaculated, and therefore paying homage to.
Halle, I loved your last post so much, I baniyn.
I baniyn you almost every morning Mrs. Merchant. If I don't, I can't concentrate in class.