The emoji ? depicts a face with a very red, flushed, and sweating appearance. It is commonly used to convey a sense of being extremely hot, whether it's due to high temperatures, spicy food, physical exertion, embarrassment, or any other situation that might cause someone to feel overheated.
Additionally, this emoji is sometimes used in a more flirtatious or suggestive manner to convey feelings of attraction or desire. In this context, it represents "hotness" or being "sexy."
Overall, the meaning of the ? emoji can vary based on the context in which it is used, but it generally relates to intense heat or strong emotions.