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1. An obnoxious person.
2. One who speaks without knowledge or reason.
3. In general, a shit head.
Wow, that shiznid keeps interrupting our intelligent conversations.
shiznid by Sparky December 13, 2004
Related Words

shiznoodle 

A term used in a movie theater to describe a preview that looked cool.
That preview is the shiznoodle! I can't wait to see it.
shiznoodle by Jeff ha ha August 9, 2003