The term PIZZERIA BUY is composed of two words, PIE and SLICE. PIE is a three-letter word that refers to a type of pastry dish made from a mixture of flour, fat, and water, usually with a sweet or savory filling. It is often served as a dessert or snack. SLICE is a five-letter word that refers to a thin, flat piece of food, such as a piece of cake, pizza, or bread. In the context of a pizzeria, it would refer to a thin SLICE of pizza. Therefore, the term PIZZERIA BUY can be interpreted as buying a SLICE of pizza from a pizzeria.