SOLLTE auch niemand wissen, weil es falsch ist:
It has been informally suggested in folk etymology that it is a shortened form of the word "pusillanimous", which comes from Latin words meaning "tiny spirit" and is defined by the Oxford English Dictionary as "showing a lack of courage or determination" or cowardly. Though this meaning would seem to be consistent with the intention of the word "pussy" when used as an insult toward a man, it is a false cognate unrelated to the Germanic derivations of puss and pussy.