Pwning someone means that you beat them so badly that they are enslaved to you. As in, you own them. Extra emphasis.

Teh is a typo that I enjoy using as it reminds me of a seventh-grade joke I had with two guys in my science class. We would pretend to read like people using hooked on phonics, and "the" was pronounced "teh-heh". Teh, of course, just lacks the heh.

A lot of it these days is just stylistic.