When you wake up next to some chick you don't recognize, you're hung over, she wants to go again, and you're morning wood throbs so hard it triggers sharp pains in your head.
I had steeley dick when I woke up with that high schoolchick until I realized she was jailbait. Then I had uber steeley dick.
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.