A sarcastic term for someone's making too big a deal out of something, either by verbosely crowing about it or by asking others to show excessive attention/respect to said trivial matter/object.
So you got an acceptance-letter from the local community-college --- like, wow! --- those enrollment-desperate academic honchos will take just about anyone, so it's really no significant praise or great honor directed your way. Whatcha gonna do with the letter --- frame it and hang it on the wall?!??
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.