This is kinda useless glitch but try it out if you want :P
First you need to wear a shovel (any kind of).
Then put the “dig” move in your favorites.
After that go to your inventory. Click somewhere between your profile and black area.
Your character should walk there.
Now go to handheld items in your profile. Use “dig” move in your favorites
While your character is doing the move wear one of your left hand handheld on and get out of your inventory.
Congratulations! Now you can’t move around.
But you can still talk and do dance moves.
To move around again go to other place or reload the page.