A plastic or metal disc about an 1/8th of an inch thick with the diameter about 3/2 of that of a quarter, used to play the game Pogs. The slammer is used in the game to "slam" (hence the name) into a stack of pogs (roughly the size of the slammer, only lighter, thinner, and paper) and knock/flip those pogs over. The metal slammers, heavier and usually more effective, were considered "cheap" (ie, they gave an unfair advantage to the user), while the plastic slammers created a more equal playing field.