I don't know but Google Trends [1][2] bears out that it's very recently common.

My best guess is that it has come up as part of the Amber Heard / Johnny Depp trial and that has spurred a lot of people searching for it.

[1] Past 5 years, March & earlier - https://trends.google.com/trends/explore?date=2017-03-01%202...

[2] Past 90 days including giant spike - https://trends.google.com/trends/explore?date=today%203-m&ge... (if you go to past year you can see the spike)