It’s a celebration word. A world that describes complete happiness. Like when you do something they say can’t be done, or when you skydive, or when you have your first kid. Extreme high light of your life!
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.