Slapstick prop is a term used to describe props used in physical comedy. The crossword solutions for this term are PIE (3 letters), XXX (3 letters) and CUSTARDPIE (10 letters). PIE is a type of pastry that can be thrown at someone as a joke. XXX is a rating used to indicate adult content, which can also be used for comedic effect. Custardpie is a type of PIE filled with custard, which can also be used as a prop in slapstick comedy.