When someone becomes more attractive to you when you haven’t seen them in a long time. Basically, your image of them in your head becomes more attractive.
Matthew: I thought you were over Terrry?
Sam: I haven’t seen him in a month, and you know what they say, absence makes the dick grow harder.
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.