See 'Shake my head', or 'smh'; When one would witness or take part in an embarrassing situation where instead of shaking one's head, one would instead say "Shake my Dan" or "smd" due to Dan being a goddamn moron.
Wtf, they have 3 krakens and a laggy e-liter? "Shake my Dan.."
Dan: "I'm in the VCy'know."