Whilst watching a documentary about American football the other day I heard the commentator use the word "winningest", as in "he's the most winningest coach in Buckeye history".
I thought I'd gone mad but I googled the word and Americans do actually use it.
Also found this funny article about the difference between British and U.S. commentators' language:
http://www.bbc.co.uk/news/magazine-22713988
"I remember a US commentator describing a whipping cross into the box that was clattered into the back of the net as: "He transfeeeeerrrs aaand compleeeeetes!!!!"