Are the kids doing it?

I've seen this a few places – and knowing the last hand gesture I learned the kids were doing (and then seeing on "Veronica Mars"), I'm wondering if this one is filthy dirty as well:

<img src="http://www.fooarchive.com/gpb/kmy2005.jpg" alt=" - " />
WEST SIDE BITCHES!!!
Despite a 2004 appearance at a Kerry campaign rally, Dave Grohl shows that he's down with the Dubya posse.
"Look dude, get the chord right! This is how it goes."
So Grohl is a trekkie…well big 'effn deal.

I'm more concerned about his Richard Simmons headband.