たんおめMeanings1interjectionhappy birthday!slangabbreviationCasual, abbreviated slang used mainly in texting or social media. Derived from お誕生日おめでとう.See also: お誕生日おめでとう今日きょう誕たん生じょう日びなんだ!たんおめ!It's my birthday today! Happy birthday!たんおめ!いい一いち年ねんになりますように。Happy birthday! Hope you have a great year.