The phrase disking is a sexual fetish reference originally coined in Brighton. The 'disker' masterbates over his or her favourite c.d. /dvd until climax therefore having disked successfully.
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.