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2.
The entrance of a woman's vagina when shes wet, in most cases used as an insult.
Roberts a poonslide for stealing my baked potato

Kim lost my motorola razr what a fuckin poonslide!
by M Style December 28, 2006
 
1.
Poonslide = a serious thread on FB when the conversation deteriorates to a sexual free-for-all
We were talking politics in a facebook group, when all the sudden we were all talking sex... it was a total poonslide.
by Jypsy Jool August 06, 2011