In several humorous children's stories, a distrot wagon-driver whose balky nag refuses to pull his burden eventually discovers da old long-stick-with-a-carrot-on-da-end (or an ear of corn, bunch of juicy grass, etc.) strategy to get said uncooperative equine to begin plodding forwards once more.
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.