The term 'absolutely nuts' can be summarized by two crossword solutions: 'GONZO' (5 letters) and 'Plumcrazy' (9 letters). 'GONZO' is a term coined by Hunter S. Thompson in the 1970s to describe his own outrageous behavior and writing style. It has since come to mean any kind of wild, reckless, or unconventional behavior. 'Plumcrazy' is an informal phrase used to describe someone who is completely crazy or out of control. Both terms are often used to describe someone who is acting in an extreme or irrational manner.