What's that kinda goofy song by that heavy black guy where he plays a dusty piano in the music video?

I'm trying to remember a song.

it was pretty upbeat, and as I recall the lyrics were something about being a loser, or not caring. I think the artist was a classically trained pianist who wrote the song as a joke and accidentally made a hit but I can't remember who it was.

What I do remember was that in the music video he played a very dusty piano at one point with a glass of red wine on the right side of the piano towards the middle of the screen.