The act of deliberately providing false information about the day of the week or other factual details to someone in order to manipulate, confuse, or undermine their perception of reality.
Nate was saying "Happy Friday!" to us on a Thursday, he was totally calfishing us!
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.