When the scene of a shart is left unattended over an extended period of time the sharticles, or particles of shart begin to harden due atmospheric exposure.
This results in the shart forming a thin crusty lining in the jocks which although uncomfortable, is sometimes preferable to admitting to having performed the initial shart in the first place.
"I knew I should have changed after that shart. Now I've got hardening of the sharteries."
"Madeline is walking a bit gingerly today, maybe she's got hardening of the sharteries..."
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