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1.
To down an alcoholic drink all in one go, without pause for breath (and sometimes without more than one swallow, unlike a chug). Most commonly used with shots.
Hey man, watch, I'm gonna slam back this vodka.
by Halfling Rogue March 02, 2010
 
2.
a version of a techno song that has been slowed down into a sick groove.
Gabriel and Dresden version of As the Rush Comes is a slam back of the DJ tiesto song As the Rush Comes
by influentza August 16, 2008