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A mixture of blood, semen, mucus and stool; which is the material "feltched" out of anothers anus/rectum.
Roderick was quite sated by the bellyful of shasm he feltched from the fetching Germaine.
by Dick Jablome April 09, 2008
When a man jacks off while taking a shit.
"Shit" + "Orgasm" = "Shasm"
Fred is so disgusting; last night he shasmed in my bathroom. (Used as a verb.)
by Mad Madame Mim November 21, 2007
Having an orgasm during a shit fit.
Her pent-up anger at his insolence finally completed itself in a perfect shasm.
by Cardinal Coolshoes March 09, 2009