A jet of diarrhea that comes out at such a velocity that, upon hitting the water in the toilet bowl, causes water and/or liquid fecal matter to splash back up onto the buttocks or anus. This stream from the bowl often resembles a bidet, but only serves to make a mess rather than clean.
"Sorry I used all your toilet paper, but I had a lot to clean up after the brown bidet."
Based on the word derp, a derpstorm is a gathering of a lot of stupid or ignorant people. Derpstorms are often composed of very opinionated and outspoken people, as such people are prone to say or do stupid things.
Derpstorms can be of any size, but particularly small ones are often referred to as a derpdrizzle. Massive derpstorms can sometimes be referred to as a derpicane.
I had to leave the political rally early because it was a total derpstorm.
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