When you accidentally walk into a room and unknowingly findthree or more guys having a gay orgy.
Jacob was out knocking on doors to notify home owners of the water outage when he accidentally walked in on a Mexican doorhanger. He was never the same after seeing that.
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.