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A party where people touch each other in the bathing suit area. Also a good pickup line if I dont say so myslef.
Brick: Would you like to come the the pants party. Oops I mean party Im my Pants?
Veronica: No Thanks Brick
Brick: How About you Ian?
Ian: No Thanks
by Ben P February 07, 2005
An erection.
Looking at that hot jailbait over there, I get a wild party going in my pants!

Hey Mick, I see you got a pillow on your lap. Party in your Pants?

I got a party in my pants
by mathandscifi August 28, 2009