蛋糕块 (dàngāo kuài) literally means 'cake piece' — a countable portion of cake, typically cut from a larger whole. The compound combines 蛋 (dàn, 'egg'), 糕 (gāo, 'cake' or 'pastry'), and 块 (kuài, a measure word for solid, chunky objects). Though 蛋 and 糕 individually evoke ingredients and category, together they form the noun 蛋糕 (dàngāo, 'cake'), and adding 块 specifies a physical, separable unit — like a slice or square served at a party, café, or birthday celebration.

This term is commonly used in everyday contexts involving food sharing, baking, or dessert service. It emphasizes shape and countability rather than flavor or recipe. Unlike the uncountable noun 蛋糕 (which refers to cake as a concept or mass), 蛋糕块 always implies a discrete, hand-held portion — often plated, boxed, or described with numbers (e.g., 两块蛋糕, 'two pieces of cake'). It’s neutral in register and appropriate for both spoken and written Chinese.