Part of a sarcastic retort to someone who speaks in the plural form, when it's been commonly understood that they really mean it to be you.

When you eat dirt for the first time and leave your family to build a shack in the woods

When someone tries to include you in a "we" that you don't feel part of, the traditional response is "We? What do you mean, we? Do you have a turd in your pocket?" Translates as semi-funny emphatic rejection of false or forced collectivism. (My "do you have a mouse in your pocket?" is the cleaned-up version of the old rhetorical rejection of the false "we.")