Hey, hey, how does it feel right now having your head being chomped off? Hm, how does it feel?
ねぇねぇ今どんな気持ち? ("Nee Nee Ima Donna Kimochi?", "Hey, hey, how does it feel right now?") is a notorious Japanese slang word taunting or humiliating the loser.
Its Ascii-Art is here and the Nicopedia article of its initialism is here. -> "Nicopedia: NDK"