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Slowness multiplied by 10^21.

A term used by the character Sho Minamimoto in the Japanese role-playing game (for the Nintendo DS) The World Ends With You.
Neku Sakuraba is so zetta slow.
by Hogtree Octovish March 23, 2012
Particularly slow. Often used in an insulting manner.
"So zetta slow!" Shô Minamimoto (The World Ends with You)
by Pi-Face April 30, 2008