Long story short, it was co-opted by 4cac alt-right nerds as an "ironic" hand gesture; meaning they want people to think it's racist, because...something something "cuck" red pill MAGA blah blah blah.
Basically it's a form of trolling IRL. If someone sees their invented gesture and says it's a racist, white power gesture, they've...uh..."won". Somehow. :kanyebp:
Of course, it has wound up being co-opted and used by actual white nationalists, because alt-right cacs are stupid.
Here's what I was thinking about
Their secret signal was to tuck their ring finger and pinky in their pocket as a sign to someone they were KKK