The term 'BURPEE BUY' is a combination of two words, 'burpee' and 'BUY'. Burpee is a type of exercise that involves squatting, jumping, and pushing up. It is often used in HIIT (High Intensity Interval Training) workouts. The word 'BUY' refers to the purchase of something. In this case, the crossword solutions for the term 'BURPEE BUY' are 'SEEDS' (5 letters) and 'SEED' (4 letters). This could refer to the purchase of seeds for planting, which is often done in conjunction with a burpee workout.