When a group of testosterone filled hetero or homo men decide out of boredom to jerkoff on a muffin, the last one to blow his wad has to eat the muffin
The guys were bored so they threw a wet muffin party.
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.