Question, How did the term Manure start?

I have been using the term Manure for a few years now and all this time I thought it was a terminology I had created.

This was brought to my attention by Scott the Red owner of Republic of Mancunia.

The term “ManUre” originated from chants about Duncan Edwards by West Brom fans following the Munich Air Disaster. “Duncan Edwards is manure, rotting in his grave, Man U are manure, rotting in their grave.”
I have done some Googling and the only references I find are from Manc Blogs, can someone please let me know if this is true?

If it is true than I have a huge apology to make.

Taking the high road.

-Antoine

antoine@empireofthekop.com