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L33tn355 is how much of a cocky, awesome, and totally awesome person or thing you are. It’s like your coolness level, but with more swearing and less confusion.
My dog has more l33tn355 than your whole family.
This video game is so l33t, I want to punch the console.
She got a 10/10 on her l33tn355 test, and I got a 0 because I failed life.