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dirty pinwheel 

someone who inserts a fidget spinner in their rectum for sexual pleasure.
"what are you doing tonight?" "oh nothing just dirty pinwheeling".
dirty pinwheel by blakz420 May 18, 2017

Dirty Pinwheel 

The Dirty Pinwheel is when you take one of those fidget spinners stick it up your ass and upon removing it, give it a spin so that the shit flies off of it.
My buddy's girlfriend left him after she got pink eye from the dirty pinwheel he gave her last week.