The phrase "nut case" is a slang term used to describe someone who is considered crazy, eccentric, or mentally unstable.
Sentences with «nut case»
Your not going there for a degree in god so why should it matter unless your a religious nut case period. (religion.blogs.cnn.com)
They embrace nut cases like this for immediate attention... It is all catching up to them as the party will fall apart in the next decade. (religion.blogs.cnn.com)
After all, I am definitely a «total nut case» for peanut butter and I know many of you are as well! (thespiffycookie.com)