Losing a contest/game/battle/argument in a humiliating fashion while the other person shows you how it is done. They remain as cool as a cucumber as if it didn't even require effort on their part.
Joe: "Ryan only has to get the blackand then he has 7-balled me in this game of pool"
Jen: "You're getting schooled Joe, jeez!"
Being taught the proper way to preform an action, via extreme ownage and embarrasment. This requires the schooler, who is always of such a high level of skill that the schoolee has no chance of saving his reputation, to utterly dominate and show no remorse. If remorse is shown, it is done in a cool and laid-back way, as in to say "Your not even worth the effort of my pinkie finger", which ironically is just as brutal as an all-out ownage.
If you ever find yourself being schooled, it is wise to not bitch about it. Doing so makes you look like a tool.
Dude...Jim was getting schooled by Bob while playing basketball. Jim decided to be a tool and talk shit about Bob while he was losing 10-2. Bob then released a can of unrelenting whoop-ass on Jim, who then had no choice but to become a traveling back-up dancer and change his name to Kevin Federline.
He can currently be found schooling Britney Spears on the art of gold digging.