interjection
Slang abbreviation of お誕生日おめでとう. Used in very casual, often online or text-based communication among friends.
See also: お誕生日おめでとう
おたおめ!今日は楽しんでね。
Happy birthday! Have fun today.
LINEで友達に「おたおめ」って送った。
I sent 'happy birthday' to my friend on LINE.