Chief White Halfoat: "Oh, Sheila, I forgot my guitar in the car, if you give me a minute to come back I can give you a strum down... (winks) if you're interested."
A trip to a grocery store, convenience store, or gas station for the sole purpose of buying an excessive amount of junk food and sugary drinks, usually with friends. A chud run often happens late at night and ends with everyone involved hating themselves afterwards.