in the russian language, "Хз" is internet slang or shortcut for "Хуй знает". people usually use this to answer a question. It means "who knows" or "who the fuck knows". basically russian version of "idk".
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.