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1.
A girlfriend. Short for woman.
"Wanna come round for a billy?"

"Nah, sorry, I gotta go home and root my wooza.
by ponkton May 10, 2004
 
2.
Your bloody penis.
"My wooza may be short, but the bastard is a real munter 'cos it has heaps of width"
by SLAMMER August 24, 2003