When a woman has "The Clap" or formally known as chlamydia. She sticks her hand down her pants and gets some of the Chlamydia juice on her hand and rubs it across someones face. Hence "The Clap Slap"
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.