What is horror-plause?

Deep disgust followed by applause. Reluctant but overwhelming approval.

Conan O'Brien's insensitive joke drew a horror-plause from his audience.

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Clapping while simultaneously expressing groaning audibly or grimacing. A schizophrenic reaction to something one find's both funny and horrific.

The audience gave Conan O'Brien only horror-plause for his monologue--no genuine laughter for him tonight.