2: l337 (online) slang for 'owned'
3: The mis-spelling of 'owned'
4: Getting showed up/embarressed in a public event by someone/something
Ryan loses to Brian
Brian: "Hahaha, you got PWN3D!"
Example for 2:
"omfg d00d i pwn3d him cuz i r r0xx0rzz"
Example for 3:
"And then I pwn3d him at Halo"
"Whoops, I mean owned"
Example for 4:
Person A: "I spent a long time writing the entire script to Harry Potter"
Person B: "Yeah, I downloaded it off the internet too"
Person C: "PWN3D!"
pwn3d aggie at Austin Boat ramp
that cat got pwn3d! (i think it died)
Bike pwn3d by vandals.
Poindexter: oh yeah? Well I've never even spoken to a girl, but have 50GB of tentacle rape pr0n on my C:\ and have every star trek episode on DVD
Eugene: omg you rule
Poindexter: omg wtf j00 pwn3DD!!!1
Guy #2) You got freaking PWN3D!
"haha, you got pwned by that guy with 4 fingers"
"all your base are mine, i pwn you"
it is part of the online language.