B. Um, I'm not sure what you're saying anymore and this conversation just got weird so peace out yo.
A. You're on the phone with some hot guy ( or girl ) and he says " hang on, oh, hey that's so and so ... Ill call you back." basically hes saying: Hey, there's someone cooler I want to talk to right now so maybe you will hear back from me . . . but Ill most likely just talk to you later when I have no one else to talk to.
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.