If you have banked something this means you have concealed an item in your vagina or your anal pipe to hide and or smuggle without detection.
Prisoner to other prisoner,
Prisoner 1: Oi, how did you sneak that mobile phone in here?
Prisoner 2: I banked it Mate! Charger too. Got one for sale if your needing one. Brand new and boxed.
When multiple persons of the same sex have intercourse with a single individual of the opposite sex (generally used term explaining multiple males on a single female). Term used in Baltimore.