A French expression derived from the saying young people use "il a des dettes et des sous" which means "he has debts and cash". Mixing debts and cash, came detsou.

Without the money aspect, it is now used to describe someone who's legendary for its ability to play games and mindfuck its entourage, strangers and even animals if he wanted to.
"Joue pas au Loup-Garou avec ce type, c'est un putain de Detsou."
"Don't play Mafia with that guy, that's a freacking Detsou."
by imdavelol June 30, 2017
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