(Noun) A term of endearment used for those moments when your loved one is behaving in a kooky, crazy, strange, or funny manner. Derived from the word "nutty" which has similar meanings.
"KiKi! You crack me up! You are such a spice nut!"
"KiKi- why did you put the peanut butter in the refridgerator? You are such a spice nut!"
"Hey, spice nut! What's up with those crazy glasses?"