The phrase points to Papantla in Veracruz, Mexico, home of the Voladores de Papantla, performers who climb a tall pole and descend upside down on ropes so they appear to fly. Ay Papantla, tus hijos vuelan plays on that image, literally saying your children are flying. In Spanish speaking meme culture the line became a portable reaction clip, shared in chats and short videos whenever a person, pet or object is launched, jumps or spins through the air for comic effect and surprise online daily everywhere now too.