An expression to be used when you are unable to locate a person who you could have sworn was just there or should be in a location where he/she is not currently.
NOTE: Ideal usage should only be employed by those who are cognizant of Bob Griese and his off-hand, and not to mention off-color, remark regarding a Columbian (although Mr. Griese assumed he was Mexican in light of his statement) NASCAR racer who fell from the top five ranking.
"Hey, where the hell did Mark go? He was just here a second ago, wasn't he?"
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.