A person who has an inadequate amount of money and then acts like a "moron" and spends it on a useless item. These items can range from a shirt too big or another unusable material possession.
Person 1: Oh man your did you hear about what Zach bought. A glass dart board.
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.