Getting screwed over by an Uber driver in any way, shape or form. Poor driving, body odor, getting dropped off two blocks from your actual destination.
I just got screwbered. My driver farted the whole time and dropped me off on the nextblock over.
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.