Pwnage (or to pwn) was a misspelling of own!!11!!1! It is usually pronounced to rhyme with same. "to pwn" means "to dominate". It is mostly used in the domain of teh competitive video games, but it has expanded to teh other domains where competitive video gamers dwell. Wikipedia and Urban Dictionary on ''teh internets'' has more information. Often included are misspellings and mis-keying of other words and punctuatation, when excited about pwning or when being pwned.