Having an Indian curry to create enough content to fill a jiffy bag and then posting the poo to your debt collector / baliff / whoever issued you a fine.
Dave: Yo man, did you ever pay that Ulez fine you got?
Steve: Yea man, I sentem a Big Narstie in the post
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.