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Abbreviation for a seldom used, vintage, expression. "Boil on a Calcifer's ass", used to imply an object and/or person is hideously ugly.
"Hey man, how did your date go last night?"

"Horrible. We got back to my place last night where we took off our clothes...her body is like a Calcifass. You know, boil on calcifer's ass!"

"What a shame, sorry to hear that."
by Professor Jsau - Harvard February 22, 2014
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