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When two men grab their own dicks and pull them back opposite of each other and release at the same time. This releasing a shockwave.
David and Gery did a double decker dick and now their in a coma.
via giphy
by Niggaeatass69 November 14, 2017
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2
The act of leaving a turd in the toilet and making your gay partner flush it with their penis
I double decker dick'd my boyfriend and he wont let me use the bathroom anymore.
by Soggy Cocks December 23, 2017
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