I’ve never been around anyone who uses the word ‘extra’ in such a way. Guess I must be out of the loop- must be new lingo. This must be misconstrued in relation to the way in which you use ‘extra’, but, when I think of it, it means ‘over the top’, and examples that come to my mind are Lady Gaga, Elton John, Dolly Parton- in other words, ‘Flamboyant’.