Here's why:
* Origins are ancient: The word has roots in Old English and likely existed long before recorded history.
* No documentation: There's no way to track down the first use of such a word, especially in informal speech.
* Language evolves: Words change meaning over time, so even if we found an early use of the word, it might not have had the same meaning or impact as it does today.
While we can't pinpoint the first person, we can explore the history of the word and its evolution. But ultimately, the "first" user will remain a mystery.