verb: to agree.
origin: small country town outside of Raleigh, NC and surrounding areas. often an affirmation of a previous statment being coorrect or incorrect.
antonym: and don't. and ain't. (untrue, incorrect, wrong, not in agreement)
Friend 2: And do!
Friend 2 is in agreement with friend 1 about the flyness of the shoes.
Girl, those shoes are fly.
Response: And ain't! She needs to ask for her money back, they're ugly.
Can also be used in whatever tense applies. i.e. and is, and are etc.