The phrase "a big amazing" seems to describe something that is impressive, extraordinary, or significantly remarkable. Typically, "big" refers to size or importance, while "amazing" refers to something that astonishes or surprises us in a positive way. Together, the phrase emphasizes the greatness or significance of whatever is being discussed.
The word "amazing" derives from the verb "amaze," which comes from the Middle English "amasen," meaning "to confuse or bewilder," and has roots in Old English "amasian," meaning "to astonish." "Big" comes from Middle English "bigge," which is of uncertain origin, possibly related to the Old Norse "biggr," meaning "strong, proud."