The act of taking an ambiguos cutie on a tour of your house during a party and then performing fellatio on him in the unfinished basement. The term can be applied to any sexual activity performed at a party without the guests knowing.
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.