From the grunge speak hoax printed in the NY times. They asked an employee of Sub-Pop records if there was any grunge slang in Seattle, she made some up, and they printed it, thinking it was real.
That editor from the New York Times is a cob nobbler.
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.