I iz is a blob-like character of the species Zizz. He is the leader of all Zizzes, although it's a mystery how Zizzes can tell each other apart, for they all are pretty much identical (except for the occasional size difference). I iz was created back in, oh, say 1998 or so by Michael Mesorana (aka Tibby or Poofmeister), and stars (along with other Zizzes)in a series of short cartoons made by Will Buck (aka Vlad). See I iz's quotes below:
"But I iz whut you iz when we iz not me waz. Iz you?"

"I iz been done cut. Hey."

"Gimme that hat."

"I iz be not going to not no movies. I like to sit."

...And the number one, most famous phrase... the one that started it all...
"I iz who I iz."
by FouyA August 27, 2003
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chav/gangsta speech for 'is this because i am...'
also used in amusement when talking to security guards.
Person 1: Yo, I'm gonna beat youz to shizzle.
Person 2: ..Iz it coz i iz blackkk mofo?

Security Guard: What are you doing in here?
Kid: Iz it coz i iz bla..bla.. (notices guard is black) ..wearing misfits?
Kid's friends: *break down in hysterics*
by CityofEvil July 14, 2007
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