The act of getting chewing gum from your
pocket, bag, place of storage, when surrounded by a large (or if you're greedy, a varitably
small amount) of people, as so that the surrounding people do not notice you have gum, and hence will not request gum from you, depleting your
store that was meant for the next week and a half.
Guy 1: "I see you have a
fair amount of Gum there, Guy 2."
Guy 2: "Yeah, I've been
Sneak-Gumming all week! Them vultures
don't got nothin' on me!"
----
Man: "*Chew*"
Everyone: "GOT GUM?! GIMMEGIMME."
Man: "Damnit I've never been very good at Sneak-Gumming".