Someone who is really awkward and quiet, and is constantly late to his friend's houses. He laughs through his nose and never does his homework. Teachers tend to cross him out on their attendance sheets, either because he's on their hit lists or because they want him.
Friend 1: Where's Chris?
Friend 2: Oh, that Lagaloser! He won't be here until 7:30.
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.