I'll remove it - I cannot see it in a quick scan through the entirety of Psychology of the Unconsciousness; even if it is found in Jung, Jung is by no means an etymologist and the theory seems flawed anyway (impossible to get plfuog -> fuk [sic, perhaps phonetic transcription intended], modern German has ficken, from MH German ficken not *fucken, this assumes the English/Pseudo-Latin came first, etc...)