custard pie noun 2custard-pie verb 1forms 4 noun2 •A pie made from an uncooked custard mixture added to an uncooked or partially cooked crust and then baked as a whole. •A prop used in slapstick, consisting of an open pie filled with custard or cream (or, more often nowadays, simply a paper plate covered with shaving foam or a similar substance) that is pushed into another person's face. custard-pie verb1 •To push a custard pie into (someone's face) formscustard-pied · custard-pieing · custard-pies · custard pies