Oh, I see, you thought I was making a CSI joke.
"yeaaaah" + sunglasses = CSI joke. It cannot be otherwise.
I'm confused. Is this because a different Who song is the intro music for CSI?
The meme originates from CSI Miami. Basically, every episode would end with the protagonist, Horatio Caine, uttering some ridiculous one-liner, then putting on his sunglasses like this:
Then, it cuts to the end credits, which plays the song "Don't get fooled again" (ironically, the worst CSI show got the best Who song) at the point it says a loud "YEEEEEEAAAAAH".
Oh. I never watched the Miami spinoff. Then I get it.