Semer la pagaille: To raise a ruckus, to wreak havoc, to cause a disturbance. Literally means to sow disorder.
As seen in: « Les quatre étudiants soupçonnés d’avoir semé la pagaille dans le métro la semaine dernière en jetant une bombe fumigène resteront sont (sic) les verrous au moins jusqu’au 23 mai. »
(Translation: “The four students alleged to have wreaked havoc in the subway last week by throwing a smoke bomb will stay behind bars at least until May 23rd.”)
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