corpsing

Verb

corpse (third-person singular simple present corpses, present participle corpsing, simple past and past participle corpsed)

1. (intransitive, slang) To laugh uncontrollably during a performance.
   • The rest of the day and the week were spent blocking and learning the lines. The only drama was the predictable one of being ticked off for corpsing. Rupert was quite as bad as me when it came to giggling and the tea-party scene which took place between Rupert, David Parfitt, Piers Flint-Shipman...1989, Kenneth Branagh, Beginning, London: Chatto & Windus, →ISBN, page 94
2. (slang, transitive) To cause another actor to do this.

See all 5 meanings of corpse