to sit back, do nothing, relax, or "skate" as you will. also means to mess something up, forget to do something.
GUY 1: yo son, did u remember to plug that cord into the wall?
GUY 2: oh snap...nah man, today im straight banksin
GUY 1: hey are you gonna help us with this or what?
GUY 2: man leave me alone im straight banksin
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