De quoi vous mêlez-vous? = What business is that of yours?
Un je ne sais quoi = A “something” (I know not what).
[Elle avait je ne sais quoi de charmant = She had a vague, indescribable charm.]
C’est un filou, quoi! (pop.) = In a word, he’s a scamp.
R.
Rabais
Vente au rabais = Sale at reduced prices; “Selling off.”
Rabattre