User blog comment:OnePiece-Kaizokudan/Big Mam Powers/@comment-3986064-20111227092332

Big Mom clearly stated that she can't stop her stomach acids from overflowing. That was not saliva but acids coming from her stomach. She has a tree on her jolly roger so you can take that too into consideration. Powers of Nature itself. Mother Nature, Big Mom. Big because of her size and mom possibly suggesting mother nature.

I still disagree with an acid DF, just because gastric juices were flowing outta her mouth.