KN4

KN4 is the abbreviation of Kyuubi-Naruto-4 from the Naruto anime/manga. KN4 is the form in which Naruto loses it and starts a rampage. It is so far the greatest number of tails he's able to get when releasing the Kyuubi's Yang chakra.

Naruto's demon fox's cloak form with four tails is called KN4.

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walking the penguin

Masturbating, jerking off. Also walking the dog.

Walking the penguin is a good thing... if you don't have any better place to put the penguin into.