Where an unknown person comes sprinting behind you, pulls down your pants, has rapid sex with you for 5 seconds, pulls your pants back up, and jumps through your window and runs away.
this random guy came through my back door and ding dong dashed me before i even noticed.
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.