1 definition by tnfungi

The double decker is a combination of the upper decker and a blumpkin. The guy is on the top tank performing an upper decker while the girl faces the wall with her feet on the toilet seat giving him a blumpkin while she drops a deuce in the bottom tank
Double Decker The bitch pissed me off so in her bathroom i gave her sister a Double Decker
by tnfungi January 6, 2009
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