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k0wned means you got totally owned by some kid who used the word k0, which is a silly term from a game called runescape where you kill another player and laugh at them
I just got k0wned by my cousin in runescape and he said 'you're a noob'
My friend got k0wned and cried in the middle of a battle
I got k0wned so hard I had to take a break from the game