Top Definition
In science fiction fandom, mean CRItical FAN ACtivity. Some aspect of an activity in sf fandom deemed more important than others, i.e., meeting minimum activity requirements in an amateur press association at the last possible minute. Coined in the late 1940s by Charles Burbee and usually (but not always) used with satirical intent.
He didn't stop to eat; he was involved in crifanac.
by rich brown August 11, 2004

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