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1.
A general nickname for a horny, hairy girl with too much testosterone. A girl who chases men.

Also can be a happy trail.
The Rizzini is an ape! Watch out on the beach!
by URI haters February 20, 2009
 
2.
To fuck a girl when you first meet her, fuck her best friend behind her back, and dump her for her best friend. Easier than sliced bread.

Also a fancy name for anal sex.

I rizzini'd her in the escalade. Then I fucked her best friend Macy and then dumped her for Macy!

We rizzini'd after second base.
by URI kids February 20, 2009