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3.
An exclimation made by a man who is certain that he is about to recieve some kind of intercourse, be it a cheeky blowy or full on balls deep poon pounding.

The words are usually said with assonance of 'choo choo' (like a train') and the arm movement commonly seen when a train driver is honking a horn
Danny: that nasty bitch Jenny is gonna feel my balls slap on her gooch. Poon poon!
by sbccrew October 20, 2009
 
1.
A vagina. A poontang. A beef curtain. A cunt. A twat.
You put the peen peen in the poon poon.
by Junkrocka May 12, 2008
 
2.
Another word for horny or turning someone on
You know Vicky? She makes me so poonpoon

Yo that porno I saw last night made me too poonpoon for words!
by vickush April 26, 2012