A nickname for someone (more likely a girl) named Sydney. BETTER than Syd the science kid. Pronounced sisnehD. Used when talking to someone named Sydney. Used on best friends or siblings.
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.