The term 'TOPPER WHOPPER' is a combination of two words, 'TOPPER' and 'WHOPPER'. The first word, 'TOPPER', is a noun meaning 'something that is the best or most impressive of its kind'. The second word, 'WHOPPER', is an informal noun meaning 'an outrageous lie or exaggeration'. Together, the term 'TOPPER WHOPPER' can be used to describe something that is the best or most impressive of its kind, but is also an outrageous lie or exaggeration. The crossword solution for this term is 'ONION', which is a vegetable that is known for its layers and for making people cry when it is cut.