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1.
Polite way of talking to a little girl about her vagina, pussy.

Grown ups have Poontang. Little ones have Poonana
Did you wash your poonana good.
by Stimpy November 05, 2003
 
2.
another slang term for pussy
dam! she got one stinky poo na na man
by Yay AREA BOI May 03, 2006
 
3.
the act of soaking a banana in the toilet, and having a person eat it without knowing
hey, bitch, you just ate a poonana.
by Beckky December 04, 2007