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the wonderful feeling of release caused by dumping a shit either so powerful or forced to be held in until the last possible moment ("the crowning"). Can be either a verb or noun.
He experienced the bliss of a shigasm in the gas station crapper after a 3 hour, Red Bull and french fry road trip
shigasm by Brett from Cincy November 4, 2007
Related Words
the release of a shit so strong and/or urgent that its rapid plunge from your ass feels so good it's almost orgasmic. Hence, shigasm
after a 3 hour, non-stop, nacho fueled car trip, you're guaranteed to produce at least one shigasm at the first QuikiMart crapper you sit your ass upon
shigasm by Brett from Cincy October 25, 2007
Sensation felt when seeing a Double Rainbow.

Similar to an orgasm but includes emotional shifts from amazement, crying, to raging, and back to crying.
Holy S***, watch this guy on youtube have a skygasm.
skygasm by shep00 December 24, 2010
The act of orgasming so hard that one starts to defecate oneself.
Lorenzo: That movie was totally pwnage.
Alex: I kno...it almost made me shigasm.
Lorenzo: So thats wat i be smellin...
Shigasm by Havik8(The Cuban) March 5, 2008

shigasmeze 

The rare act of shitting, orgasming, and sneezing all at the same time. The ultimate pleasure. Typically so intense that the party committing the act spontaneously combusts.
We all miss Smitty. A man of rare gifts. One to attempt to experience all of the world's pleasures; until the day he happened to glance at the sun while receiving oral sex on the toilet. The burst of flame was witnessed for miles and his cries of pleasure shall be remembered for generations to come. A Shigasmeze for the ages.
shigasmeze by SpoonMenace July 23, 2017