dox originates from docs which is shorthand for documents. i think it might predate the worldwide web, if not it was an early internet thing.
the second x on doxx either originated from its spelling/pronounciation in some other languages bleeding over, or from leetspeak "haxx" hard to say which one or when it began.
around 2005-7 several electronic security companies had the word doxx in their name. it started to become common internet vernacular between 2008-10, it began to be used by normies in 2012 and has been widely used since 2014.
goons have claimed ownership of the word since a little bit after the first toxx clause, its nothing new.
i don't think the original toxx clause on somethingawful had even happened for a few years when the second x started showing up in doxx but i don't quite remember exactly what year toxx became a thing since it was so long ago.
if i have the timeline right in my head, reddit's first mention of the word doxx might predate the toxx clause too lol. somethingawful has an overinflated sense of importance.
