To be used in texting/IM when a potentially dangerous/risky situation presents itself. Created by the writer of 13 the musical, Jason Robert Brown. Very useful, even if nobody knows what it means.
Patrice: I got your text...but what's "CQDBTIOE"?
Archie: Come quick, danger beckons, time is our enemy. DUH.
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.