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1.
licking a girls pussy delicately while she is taking a dump
Ryan applied a twumpkin on the cute girl while she was leaving some timber.
by Harry and Gene October 31, 2009
 
2.
The unprecedented act of tweeting, while receiving fellatio, while defecating. A portmanteau of "tweeting" and "blumpkin." Coined and first performed by Tim Beall.
Tim: "Dude, I just tweeted while I got a blumpkin!"
Mikey: "That's fucking epic!"
Tim: "Yes, it is. I call it... THE TWUMPKIN!"
by PepperidgeFarm May 04, 2011