One of those words that you use when you're in a class and you need to express your discomfort or anger, but the teacher is standing behind you, so you can't swear your heart out.
Or one of those words you look up in Google just to see if anyone else has defined it yet. Which they haven't.
Adjective/noun. Something that is so random you can't come up with a word to describe it. Also used when you can't think of the correct adjective fast enough. Also used as an exclamation.
That test was SO FLARLAR!
FLARLAR! i forgot my keys!
I wish that FLARLAR would give us some candy.