Definitely one of the strangest French idiom out there. It translates as “The English have landed” (from a boat). So, what is the relation between the English and menstruating? Well, this expression dates back to Napoleon and the British army, then called the redcoats. Go figure!
Guy 1: Dude, don’t fuck with her today.

Guy 2: “Why?”
Guy 1: “Because mans she’s pissy. “The English have landed.”
by Ccs46 October 6, 2017
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