Definition of "Slug" :

noun: (boxing) a blow with the fist

noun: any of various terrestrial gastropods having an elongated slimy body and no external shell

noun: a projectile that is fired from a gun

noun: a strip of type metal used for spacing

noun: an amount of an alcoholic drink (usually liquor) that is poured or gulped

"He took a slug of hard liquor."

noun: an idle slothful person

noun: a counterfeit coin

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

verb: strike heavily, especially with the fist or a bat

"He slugged me so hard that I passed out."

verb: be idle; exist in a changeless situation

"He slugged in bed all morning."