histrionicism
/ˌhɪstrɪˈɒnɪsɪz(ə)m/noun
Histrionic behaviour; pretence, play-acting; exaggerated or excessively theatrical words or behaviour.
Origin
Mid 17th century; earliest use found in Edward Waterhouse (1619–1670), heraldic writer. From either histrionic or histrionic + -ism.