The act of scratching your scrotum to the point where several layers of skin have been scratched off.
John: bruh, I Runched my balls and now I can't walk properly.
James: wow, how itchy were your balls bro?
when you are running and you are out of breath, and feel you're about to die or pass out.
person 1: damn i'm about have a runch
person2: lets slow down and get water
An act of avoiding the lunch rush
Carol, I know the calendar invite says noon but maybe we should runch now before the line gets to long.