When one, usually a fat ass, has an itch in the ass crack (or a weggie) and proceed to stick their whole hand down their pants to itch and remove debris from their sweaty cack. The lint and remaining materials in the ass crack that are removed can be referred to as 'the pumpkin'.
Wow I can't believe that bitch is diggin' for pumpkin like that on the beach. That's nasty.
by GoNads2 January 11, 2011