Someone that goes around checking out asses and then pointing out the ones that need assassination, usually by rim job or by penis. Usually male looking at female butt also could be male looking at male.
Why does Pat drool at the same time he seeyour ass? Oh he's just training to be an assasasin!
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.