Kenshi Yonezu - Flamingo
You're a flamingo...
One of the title songs from Kenshi Yonezu's ninth single, Flamingo / TEENAGE RIOT.
The "fla-fla" parts are a play on "furafura," the word for "stumbling/unsteady on your feet" used elsewhere in the song.
Original video: https://www.youtube.com/watch?v=Uh6dkL1M9DM