BUR #59274 has been approved by @evazion.
mass update favgroup:54553 -> anti-gravity_lean
I thought it would be funny to have a tag for this specific move. Basically "leaning forward at the ankles while keeping the rest of the body straight". All the sources seem to call it the anti-gravity lean so that should be the correct name.
https://en.wikipedia.org/wiki/Smooth_criminal
https://michael-jackson.fandom.com/wiki/The_Anti-Gravity_lean