A to the K
You do this when someone sends you a long, sad message and you're too lazy or too dumb to reply. It's like you just said, 'F*** you' in the most annoying way.
She sent me a 500-word message about her ex. I replied with a K and went to sleep.
He cried about his dog. I sent him a K and told him to eat a meatball.
My friend sent me a long message about his problems. I replied with a K and went back to my game.