When two people sit in the toilet together and urinate simultaneously.
My wife joined me for a seat on the toilet to participate in a double waterfall.
When your diarrhea is so bad and powerful that it shoots through to the other side of the earth.
After that spicy lunch, I had to run to the bathroom for a Chinese Volcano.
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To ejaculate in someones mouth causing a salty aftertaste.
I quenched her thirst with a saltine splash.