Name of a flying camel in an animated series about Shazzam! the genie.
Look! Here comes Kabooby!
And the camel says: Ka-booohoho-by
When you have told a series of funny jokes, yet you go one joke too far.
You are no longer funny, you just sound like a dick.
Oh, that one was a kabooby!
That's not even funny, what a kabooby!