A fiendshadow is a deviant and will often engage in sexual intercourse with people, especially its teachers, i.e its driving instructor. When it cannot engage in sexual intercourse, it watches copious amounts of Japanese porn (hentai).
Fucka Fiend (short for fiendshadow in many cases), he fucked my driving instructor Ira!
by CowCentralTootToot September 22, 2018
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