What is the language of word supreez de supreez?

"Supreez de supreez" is a French phrase. It's a play on words, combining "surprise" (which is "suprême" in French) with "de" (meaning "of" or "from") and the word "suprême" again.

The phrase essentially means "surprise of surprises" or "the ultimate surprise." It's often used humorously to express astonishment or shock at something unexpected.