When you and a few friends make a circle and jerk each other off, and afterwords cut off each others penises and begin to put ketchup on them and slowly eat them when receiving anal from another partner.
Billy: Want to have a "The ISIS Circle Jerk"
Friends: ALL HELL YEAH
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.