corflu:

CORrection FLUid, a substance in much demand during the low-tech, pre-computer days of fanzines.

FIAWOL:

Fandom Is A Way of Life.

loc:

Letter of Comment, a response to the material in a zine, meant to give the authors and editor feedback.

'zine:

See fanzine. An amateur SF publication (often shortened to zine) sometimes including stories, con reports, book reviews, articles of fannish interest, and almost always LoCs.