A horrible deal that even an idiot could understand is not worth the risk. It's also a well known card from Hearthstone that gives the opponent the ability to play all the spells in their hand for free.
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.