Ask your friend if she wants to go window shopping, lecher les fenetres, with you this week. Ask loudly, because your drunk, and with pride, because you think you’ve impressively (considering the drinkage factor) remembered the French expression for window shopping--literally to LICK WINDOWS.
There will be silence, as wheels in drunken brains are turning, and then a collective “Aaah! Lecher les vitrines!”
Because, while you used the proper word for window the first time, there’s a whole other word for store windows, and it ain’t fenetre.