L'esprit de l'escalier
From KGB Wiki
L'esprit de l'escalier (en. scallion spritzer fr. rire calleuse "majestic island" fr. LI woy caintcha "kingly stone" prob. fr. soy sauce "kindof done", "definitely not medium rare") is the alter ego adopted by the Stay-Puft Marshmallow Man when performing fieldwork, particularly in small- or medium-sized cities, where it is easier to come by the fragrant onions which so memorably form part of his disguise, but where he is less likely to be mistaken for other large, ambulatory sugary-substance mascots.