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1.
uber is somewhat correct, but the word SHIZA isn't.
The German word for shit is Scheiss, or Scheisse (nouns have the first letter capitalized).
An example would be:
Ich habe ein uber scheiss!
I have a huge shit!
by UBERMONKEY February 23, 2005
 
2.
German meaning for Huge Shit
I have to take a UBER SHIZA!!!
by Poof6001 December 09, 2004
 
3.
it's likely that Shiza approximates the pronunciation of 'Scheisser' which would be 'shitter' - someone who does a lot of shit.
He's screwing up anything he does; he's an uber Shiza!!
by heinz March 12, 2005