The woozy face emoji (a slightly drunk, melted-looking face with uneven eyes and a wavy mouth) is most often used to signal 'I am drunk', 'I am exhausted', or — very commonly online — 'I find this person extremely attractive in a brain-melting way'. Among teens the third meaning has become the dominant one: posting a celebrity photo with this emoji means 'this person is unfairly hot, I cannot cope'. It is harmless. If you see it under a photo of a singer or actor, your child is just expressing fan-style attraction.