Hereditary is full of small details that elevate the viewing experience once you catch them and make them part of the story, among them Charlie’s (Milly Shapiro) constant tongue-clicking noises. After rising to fame with short films, most notably The Strange Thing About the Johnsons, Ari Aster made his feature-length directorial debut in 2018 with Hereditary. Also written by Aster, Hereditary is a psychological horror movie that earned him a lot of praise, also becoming a box office hit and A24’s highest-grossing film at the time.

https://screenrant.com/why-charlie-makes-tongue-clicking-noises-hereditary/