sxu is the opposite of sux, so it means you totally pwn people.
omfg! that 1337 guy sxu!
by UndeadChocobo January 25, 2005
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When somebody gets owned or is just a retard named timmy. Sxu can be used in every sentence.
omfg mothball! u sxu!
by Toofy January 14, 2005
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