Term used by teenage boys when they desperately want to have sex with a very hot looking girl....they just want 5 minutes to put it in, wiggle, and pray to God that they can cum.
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.