'Purse pickles' (or 'pocket pickles') is a collective term for leftover condiments, side veggies, or other sauces kept on one's person after a meal, in anticipation of the next meal.

Purse pickles are almost always acquired from fast food or fast-casual restaurants, and are almost always used on meals of those types.

Anyone who is frequently in possession of pocket pickles is a 'tartar toter.'

A variant of this term is 'glovebox garnish,' which applies to similar items which are stored in a vehicle.

Any vehicle which frequently contains glovebox garnish is a 'tartar trove.'

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