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1.
A prinnie is another way to say a really long cock penis or whatever you want to call it. Length usually refers to about 8.5+ inches.
He has a bigger prinnie than Samuel L. Jackson
by almostskater1234 March 17, 2008
 
2.
Shortened version of princess.
Shey called me prinnie after she got sick of my bitching.
by ck April 29, 2004