Something that happens to incontinent older women when they have sex. Simultaneously poo, pee, and orgasm. From SH*T combined with P*SS and ORGASM.
"Bernie is treating me to the senior's menu at Denny's tonight, so I think I'll finally go all the way with him. I just hope I don't shpasm."
by Frasier Nutzov March 02, 2007
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