avant-garde, mid-20th-cent. drama made up of apparently absurd, incongruous, or pointless situations and dialogue, typically expressing the existential nature of self-isolation, anxiety, frustration, etc.
See theater of the absurd in American Heritage Dictionary 4
noun
A form of drama that emphasizes the absurdity of human existence by employing disjointed, repetitious, and meaningless dialogue, purposeless and confusing situations, and plots that lack realistic or logical development.