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Slugging average is the ratio of the total number of bases achieved on hits divided by the number of official times at bat. The variables used for hitterswere: batting average (ba), runs batted in (rbi's), slugging average (sa), runs scored (r), strike outs (so), stolen bases (sb), and fielding average (fa).
Princeton's WordNet(5.00 / 1 vote)Rate this definition: bullet, slug(noun) a projectile that is fired from a gun. slug(noun) a unit of mass equal to the mass that accelerates at 1 foot/sec/sec when acted upon by a force of 1 pound; approximately 14.5939 kilograms. slug(noun) a counterfeit coin. sluggard, slug(noun) an idle slothful person.