Noun. Slang word for money, especially that obtained by criminal, illegal, or generally shady practices, e.g. selling drugs, prostitution, slave trading. Can also mean a pay check while working as an illegal immigrant. Used first by people in the black market and the Mafia.
Additionally, To 'give someone the mudsack' generally means to pay someone for doing something sneaky for you that you didn't want to do yourself.
Jones: "So, Tommy, did you bring me the mudsack?"
Tommy: "Oh man! Jeez, I was too busy running away from the cops to pick it up!"
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"