Is the sign for 'literally' the same as 'true'?
Yes, in ASL, the concept of 'literally' is often signed using the same sign as 'true,' 'really,' or 'actually,' as they all convey that something is an absolute fact.
Can I use this sign when I mean 'figuratively' but say 'literally' in English?
In English slang, 'literally' is often used for exaggeration. In ASL, if you are exaggerating, it is usually better to use exaggerated facial expressions or signs like 'wow' rather than this sign, which implies strict factual accuracy.
Does my finger have to touch my chin?
It doesn't have to press hard against your chin, but it should start very close to or lightly touching the chin before moving forward to ensure the sign is easily recognized.