Originating from the action of raising one's hand in class with the forefinger and thumb in an L shape.
To Ken someone, or to be Kenned, involves the thrusting of a hand in the aforementioned shape in or on someone's person, usually in the facial area.
"That guy keeps Kenning the teacher."
"Quit Kenning my face already!"
"You've just been Kenned!"
"Kenned is a word I can spell. lol."