1. A rhetorical question inferring that a person is ignorant or unintelligent, and that they lack knowledge or skill relevant to the situation.
2. A congratulatory phrase inferring that a third party is ignorant or unintelligent, and lacking knowledge or skill relevant to a situation.
2. ::Sees a hot chica walk by:: "What you gotta know!"
3. Its friday night, what you gotta know?!