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1.
1337hax is a term that means you did something impossible that is amazing. So it's actually hax, but so 1337 that noone cares.
Me shooting noob through a wall
Noob: 1337hax!
by DC Gold November 11, 2008

Words related to 1337hax

1337 hax 1ee7 31173 elite hack hacks l33t leet rofl
 
2.
1337 hax means literally "Leet hacks" or "Powerful/Uber hacks"

Basically, a 1337 h4xor uses 1337 hax.
World of Warcraft Term (common).
If somebody is using speed hacks or any other hacks in WoW, people say..."Dude, 1337 hax"
"Zomg, 1337 hax brah"
"rofl, 1337haxxx"
by Leeeeeeeeeroooooooooooy Jenkins October 23, 2007