Are you looking for the Tagalog word Ba't?

Ba't is the short form of the question word Bakit.
This shortened form Ba't is never used alone.
There has to be some other word after it.

Bakit ganito?
= Ba't ganito?
Why like this?

Bakit ka nandito?
= Ba't ka nandito?
Why are you here?

If you were looking for the translation of the English word "bat"

a bat (club) usually used to hit something or someone

flatulence; a fruit bat

a bat like the ones associated with Batman

Tagalog Workbook