We found one dictionary that defines the word metatheatrically:

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1. metatheatrically: Wiktionary

Definitions from Wiktionary (metatheatrically) ▸ adverb:  In a metatheatrical manner. ▸ Words similar to metatheatrically ▸ Usage examples for metatheatrically ▸ Idioms related to metatheatrically ▸ Wikipedia articles (New!) ▸ Words that often appear near metatheatrically ▸ Rhymes of metatheatrically ▸ Invented words related to metatheatrically