Given the image it's commonly used with being a literal neanderthal it's easy for people to not know the origins of the phrase "Unga Bunga"

Honestly I didn't know it until this thread too

Edit: Basically what I'm saying is it's common usage in meme format doesn't attach it all that much to its history so not knowing the history of it is understandable.

It reminds me of the "Change my mind" meme that depicts Steven Crowder (a far right talking head). A lot of people probably didn't know that was him until somewhat recently even though the meme has been around for a long time. Would you say those who used the meme not knowing it was Steven Crowder adhere to his political views or even accept them? Especially in the time before it was wildly known that it was him and what his political views were.

The "Change my mind" meme spread way faster than his popularity.