lexist

(adjective) used to describe a person with extreme enthusiasm in any given situation unaware of how exaggerated and embarrassing their actions are to themselves and the people around them. also used to describe exaggerated or fake happiness.

Jake: why is she singing and dancing without inhibitions? she's making a fool of herself.

Meghan: clearly she's lexist.

Annie: she's fucked.
Meghan: she is unaware of her lexism.