An event during a bowel movement where the fecal matter strikes the water with such force that it rebounds onto the bum and/or underside of the seat. Especially likely during diarrhea.
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.