おめでとうさんalso: おめでとさんMeanings1interjectioncongratulationsOsaka dialect equivalent of おめでとう. Casual and friendly, used among close acquaintances or in informal settings.誕たん生じょう日びおめでとうさん!Happy birthday!合ごう格かくしたんやて?おめでとうさん!I heard you passed the exam? Congratulations!