NUTS OR CRACKERS is a term used to describe someone who is acting in an irrational or CRAZY manner. The crossword solutions for this term are LOCO (4 letters), MAD (3 letters), and DAFFY (5 letters). LOCO is a Spanish word meaning 'CRAZY' or 'INSANE, ' while MAD is an English word with the same meaning. DAFFY is an adjective used to describe someone who is silly or foolish. All three words can be used to describe someone who is acting in a way that is not rational.