Definition of "apan"

The greatest apan of all time lives on a quiet old street rising above Hagerstown, Maryland.

1990 August, Guy Lillian, “'Tis the Season”, in Mimosa‎, number 8, page 4

Most of the participants in the mundane apas are hobby printers—-and the disdain with which our fandom once viewed Xeroxing of fanzines is but a pale reflection of the way mundane apans have looked upon the mimeo and the ditto as a means of publishing "papers" (as they call their amateur publications).

1998 October 3, Brown, Rich [Dr Gafia], “Fan Terms (1)”, in rec.arts.sf.fandom‎ (Usenet), retrieved 2018-06-13, message-ID <19981003020622.14181.00000964@ng52.aol.com>

I immediately began a cutback. I remained an enthusiastic apan, but by the time I gafiated around 1976, I was in only one, FAPA.

2006 May, Arnie Katz, “The Thin Veneer”, in confuSon‎, volume 1, number 4