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Pulled It Out Of My Ass - used in university or high school assignments when referencing statistics where you don't have an accurate source, usually followed by an institute of sorts i.e. "PIOMA Institute of Statistics" or "Pioma Institute of Health and Science" for example. Used when you have a fantastic point or a very solid assumption and absolutely no data to back it up, it sounds professional and serious enough that it will not be questioned.
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