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From the theater: to laugh uncontrollably and not be able to stop. (Source: Cate Blanchette on the 12/04/06 Tonight Show). Wikipedia defines it as follows: "Corpsing is a theatrical slang term used to describe when an actor breaks character during a scene - usually by laughing or forgetting his or her lines, or by causing another cast member to do so. Though the origin of the term is unknown, it refers to almost literally murdering the scene.

A BBC TV program on 18 November 2006 stated an opinion that the term "corpsing" originated when there was a corpse on stage, acted by a living actor: there was sometimes a tendency to try to make that actor laugh."
"Hugo Weaving was in a production of King Lear and he could just sat there corpsing."
by Tom McNamee December 04, 2006
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Nov 23 Word of the Day
A massive dump that takes 10 to 15 times to flush.
After Thanksgiving, I had to Take a Trump.
by JRBIV December 11, 2019
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To fornicate with someone who is not taking an active role, usually out of nervousness or disinterest in their partner, but because of its macabre allusion to necrophilia, it is not unforeseeable that it could be because the person is non-consenting.
"Man, last night I was with Amy, and when we went up to her bed, she just laid there like a corpse; it wasn't no fucking, it was corpsing!
by amik February 02, 2007
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The act of sleeping so deeply that one looks like a dead body.
My roommate David was so tired that he was corpsing on the ground, in front of the door.
by First Stall September 16, 2011
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When a man performs either varginal and anal sex and cock goes flaccid and fake a organism
β€œIt was so embarrassing last night I was corpsing while fucking Beth”
by The blue baller December 24, 2017
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