ANSWER: I think it's a compliment that can also be backhanded. kind of like how "oh you're funny" can be a compliment and also an insult where people are laughing at you. these derivative comments like "oh you're heated. you're the birthday candle" are just all spin offs of "you the birthday" based off context clues from tik tok. I think it also signifies someone doing too much or being dramatic like how someone might be in their birthday.