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P base four minus one is just a fancy way of saying you're too lazy to pick the right number. It's like saying you're still a kid when you're clearly a man with a hard-on.
My buddy said he was P base four minus one because he couldn't decide if he wanted a pizza or a muffin.
She called me P base four minus one because I took 10 minutes to pick a shirt.
He said he was P base four minus one because he was still wearing pajamas at noon.