The Pokemon Nignamer's definitions

Nigname

A nigname (also spelled "nig name," "nig-name") is a name given by replacing the first letter or syllable of one's name with an "N," thus spelling out "nig."

"I just went to the Pokemon nicknamer in Saffron city and renamed my Jigglypuff into Niggleypuff!"

"Nice nigname yo!"

by The Pokemon Nignamer September 23, 2009