The act of bumping your own thread/post/video etc. on a forum/website/image board/message board to make it more popular than it actually is among real people. Used as a way to 'kick start' a post to help it gain popularity.
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.