A guy that is usually quiet and doesn't seem to do much the first time you meet him, but is actually very sharp and cunning(and usually cooler than normal people). You have to meet this guy when he's high.
I bumped into a rehlan yesterday. He was fuckin amazing at the bar. He even smooched the hot bartender chick and the best part was that he wasnt even drunk
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.