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When a person is taking a picture, and the people being photographed act as though the photo is candid.
Him: "Hey, I'm going to take a picture"

Her: "ok i'm chellin"
by Bert Nerpman December 13, 2011
(v.) playing a game of NHL on a video game console, usually in a relaxed state
Kevin: Hey I have a date tonight, can you leave the door unlocked?
Paul: Oh yeah, I'll be chellin' all night.
Kevin: Oh I wanna chell! Rachel can wait.
by The French Rod February 03, 2014