(verb) To masturbate under a desk or table during class.
Only applies to men masturbating as "craig" is a masculine verb. Only masturbating under a desk or table does not constitute as craiging, the deed must occur in a classroom during a lecture or other educational lesson.
Origin: From the Celtic name "Craig" transformed through anthimeria from a noun into a verb because of a dumbass of the same name performing said act.
"Hey, did you hear about that kid in Mr. Witt's class?"
? Yeah I heard."
"He was totally craiging!"
"Did you see our substitute teacher's cleavage
"Yeah, I'm totally going to craig to that"
"Great idea man, pass the hand lotion."