The act of wearing a piece of clothing (usually a bikini bottom or flip flop) with a die cut design (usually in the shape of a heart or stars) which allows the sun to shine through and leave a tan mark in the shape of the die cut.
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.