Green’s Dictionary of Slang

(US) to attack.

1997		Simon & Burns Corner (1998) 125: Manny Man spotted a Lexington Terrace rival who had earlier banked Tae.
1997–2001		Online Sl. Dict. 🌐 get banked on adj 1. to be hit, punched, attacked (‘He got banked on.’).
2001		OnLine Dict. of Playground Sl. 🌐 bank v. To hit, e.g. ‘Do that once more and I’ll bank ya!’.