A variation of the cunnilumpkin in which a woman receives cunnilingus while she deposits feces into the upper tank of a toilet. This is the female version of the blumpkin decker, and is far more difficult.

A combination of the cunnilumpkin and an upper decker.
The hostess of the luncheon offended Mary and in turn embarrased her husband, so the two of them snuck off to the master bathroom did a shameless cunnilumpkin decker.
by Mental Pickpocket October 30, 2004
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