tart 1 (tärt)
adj. tart·er, tart·est
1. Having a sharp pungent taste; sour. See Synonyms at sour.
2. Sharp or bitter in tone or meaning; cutting.
this definition about sums it up. madison discovered what the word tart means. and the word sweet. although her reactions were hilarious, she still loved it & kept going back for more & more. this video makes me laugh every single time. her little taste buds are so delayed!