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1.
ROZZA, British English slang for the police.

see also;

copper
pigs
the filth
crushers
hurry up mate the fucking rozza are coming
by meniven December 12, 2003
 
2.
A ginger person, specifically one who gets bullied due to the colour of their hair
Ha ha look at that Rozza, he's one of those ginger mutants.
by Eddy The Hero April 28, 2008