A green, algae-like fungus that develops around the anus. May lead to Benoit and Schlitz Schlong.
"After the whore strapped one on I got a bad case of Sarnac."
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Fungus that develops on the penis after having deviant anal intercourse with a partner who has contracted Sarnac. Often the penis will become rotten and ooze puss. May lead to Benoit
"I shouldn't have had butt sex with that whore because her Sarnac gave me Schlitz Schlong."
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When one has Sarnac and it passes to the grundel/taint.
"I had a bad case of Sarnac that exploded into Benoit."
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