Top Definition
Somewhat similar to a blumpkin in that it involves fellatio and taking a crap. However, instead of the man taking a shit while receiving fellatio, the woman takes a shit while giving the man fellatio.
Watching that slut drop a deuce gave me a halfie, so i pulled my dick out and made her finish me with the upsidedumpkin.
by blumpkinfan2000 October 12, 2009

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