Webster's English Dictionary

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slug

1. slug \'sl*g\ n [ME slugge, of Scand origin; akin to Norw dial. slugga to 
   walk slug]gishly; akin to ME sloor mud - more at SLUR 1: SLUGGARD  2: any 
   of numerous chiefly terrestrial pulmonate gastropods (family Limacid ae) 
   found in most parts of the world where there is a reasonable supply of 
   moisture and closely related to the land snails with a rudimentary shell 
   often buried in the mantle or entirely absent 3: a smooth soft larva of a 
   sawfly or moth that creeps like a mollusk 
2. slug n [prob. fr. 1slug] 1: a lump, disk, or cylinder of metal : as  
   1a1: a musket ball  1a2: BULLET  1b: a piece of metal roughly shaped for 
   subsequent processing  1c: a metal disk for insertion in a slot machine; 
   esp : one used il legally instead of a coin 2a: a strip of metal thicker 
   than a printer's lead  2b: a line of type cast as one piece  2c: a usu. 
   temporary type line serving to instruct or identify  3: a single drink of 
   liquor : SHOT  4: the gravitational unit of mass in the fps system to which 
   a pound force  can impart an acceleration of one foot per second per second
3. slug vt or slugged;  or slug.ging : to add a printer's slug to 
4. slug n [perh. fr. slug (to load with slugs)] : a heavy blow esp. with 
   the fist 
5. slug vt or slugged;  or slug.ging : to strike heavily with or as if with 
   the fist or a bat