Origin of the Word 'Bleh'

I have an email search program which essentially lets me search all over 120,000 emails in a few seconds. Anyway, I remember using the word 'bleh' when nobody else did. So I did an email search to find the earliest use of the word. I found it in an email from April 14th 1998, but I didn't use the word, it was an American friend in Florida called Jonathan Harp (who was helping us write movie reviews) who mentioned it in a review.

So there are 3 possibilities... (1)Is Jonathan invented it, I used it, and people copied me. (2)Is Jonathan didn't invent it, I used it, and people copied me. (3)Jonathan invented or didn't invent it, and people copied HIM.

Either way, it's nice to think I popularized a word.