1. (adverb) Used to emphasize the level of a certain verb or adjective.
2. (exclamation) "Vãi" can also be used on its own when you are extremely surprised by something, you can say: "Vãi!"

Literal meaning:

1. (noun) Refers to an elderly woman who specializes in going to temple to worship Buddha.

2. (verb) Refers to the act of throwing in many directions (synonymous with ''sprinkling''); or just the state of falling loosely or scatteredly.

Example:

Ngon vãi! = Ngon quá/Rất ngon!