1. carve a pumpkin with a sad expression on it.
2. defecate inside said carved pumpkin.
3. place newly created DUMPKIN on/in/or around another person's porch, steps, or house.
"hey harry, why does you pumpkin look so sad?"
"oh, this ol dumpkin? it's because i took a shit in it."
Somewhat analagous to the blumpkin, this is when a guy, while standing upright, is receiving oral sex from a girl sitting on the toilettaking a dump.
Last night, after going out to eat at Bobby Big Sleep's Burrito Barn with my girlfriend and her best friend, all 3 of us had the runs, so, when we came home, my girl gave me a dumpkin while I glass-bottomed boat her best friend.