The noun form “nut,” meaning “crazy person,” may have a different history. By the mid-1800s, nut was slang for head. If someone said you were “off your nut,” that would mean you were crazy. Psychologist Timothy Anderson points out that many recent euphemisms for insanity have sexual connotations.

What is the meaning of crazy nuts?

nuts \NUTS\ adjective. 1 : enthusiastic, keen. 2 : insane, crazy.

Why is nut slang?

Where does bust a nut come from? The expression bust a nut first surfaced in the 1930s. Nuts is a slang term for “testicles” that has been around since the mid-19th century. The term bust a nut implies that something explosive is going on with one's testicles—metaphorically, we hope.