Crack (-fic): refers to stories in which completely ridiculous, unbelievable or insane things occur, often without reasonable explanation but great enjoyment. Are generally written shamelessly and with no excuse beyond a desire to have fun. Often are also PWPs, though not always NC17. Are almost always humourous, although it is possible to write them seriously. Is so referred not only because such crackfics often seem as if they could only be conceived by an author riding a high, but also because they can be hilariously addictive to readers as well.
See also: Humor and/or PWP
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A-Z Fanfiction Guide: Terms to Know
RandomAn A-Z List of all the fanfic terms YOU should know! (Cr. Goes to Angerfire.com for references and information) * this will be updated periodically, so if some things are missing, they haven't been added yet.