i will be surprised if you can guess where this saying came from! ( hint.. its from the 80s and they made a 3rd movie recently!) "Hello my excellent friends!"
Technically speaking, "Excellent!" as an expression pre-dates the franchise concerned here. But, as it's shown here, it came from Bill & Ted's Excellent Adventure, and also Bill & Ted's Bogus Journey. It's also used in at least some of the spin-off video games that were based on the franchise.
Don't forget, TamaTalk covers a wide range of users of many different ages - some of us are old enough to remember when these movies were new!