To cause a diminishment in stature or street cred to another through an intentional act of disrespect, or to oneself by incaution or lack of situational awareness. To diss.
The aging hipster bepunks himself whenever he walks out the door with his shorts at half mast.
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.