When you first start out on Neopets, there’s something called the Neoboards. This is a type of forum that can answer your questions about the Battledome, quests, foods, or even a place to connect with Newbies such as yourself:
I pwn you!
Pwning means to own. So technically, if someone says this to you, that means they’re either owning you, will own you, or are beating you at something.
Joo are a loser!
Joo is NOT a Jew. Joo means you. So if someone says this, they’re telling you that you are a loser.
Mwuahahaha. Wow. So technically, this is self explanatory. It’s an evil laugh. Or just a really insane laugh O_o Hopefully you get the point.
I’m a l33t restocker.
L33t. Technically this is computer lingo. If you don’t know already, this means “leet”, which is short for “elite”. So they’re saying they’re a really awesome restocker that buys low and sells items for higher prices.
Ooh, that’s spiffeh!
SPIFFEH. Er. Queer word. Spiffeh is spiffy. Which means awesome (technically). People do this with other words such as bunny (this gets turned into bunneh) or cookie (which would be turned into cookeh).
I hope this helps ^o^