What does TBA in movies mean?

As with most medical abbreviations TBA could mean any of about 25 things, it depends on where it is written.

The most common is To Be Admited or To Be Arranged or another one is To Be Absorbed.

It could also be diagnosis such as Tracheobronchial Amyloidosis.

If you provide me with some more info then I shall try and narrow it down a bit further for you.