The three crossword solutions for the term 'YOU CAN'T FOOL ME!' are AHA (3 letters), OHO (3 letters) and KNEWIT (6 letters). AHA is an expression of surprise or realization, usually said when one has figured out something. OHO is a similar expression of surprise or realization, but with a more triumphant tone. KNEWIT is an informal phrase used to express that one knew something all along. All three of these expressions can be used to express the sentiment of the phrase 'YOU CAN'T FOOL ME!', which is a declaration of confidence in one's own ability to recognize deception.