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(noun)peice of shit diamond star motorsports. DSM's are notorious for breaking down every tuesday, or whenever you start them.
"I was fired from my new job because my POSDSM broke down again."

"My g/f got gangbanged by five black guys because my POSDSM steals all my monies."
by kobykris October 17, 2007
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Abbreviation: "Piece of Shit Diamond Star Motors". A direct reference to the tendency of DSM's to break down.
I couldn't afford an EVO, so I'm stuck with this POSDSM.

I got busted with 10 keys of coke because my POSDSM broke on the freeway.

by Lucky_Zucky September 24, 2008
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