To socially embarrass oneself by doing something stupid - usually resulting from drunkenness.
Wow, Greg really fucked the pumpkin that time!
A slightly chubby (or otherwise relatively unfortunate looking), overtanned girl that one takes home (usually down the shore but not always) after all her hot friends were already dispatched like 3 legged wildebeasts in the wild, and the club/bar is about to close.
Also can be referred to as a "Cock-Smack O Lantern"
The night was getting late so I dove on the grenade and took the Fuck Pumpkin home.
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