Meaning

• Any of many terrestrial pulmonate gastropod mollusks, having no (or only a rudimentary) shell.

• A slow, lazy person; a sluggard.

• A bullet or other projectile fired from a firearm; in modern usage, generally refers to a shotgun slug.

• A solid block or piece of roughly shaped metal.

• A counterfeit coin, especially one used to steal from vending machines.

• A shot of a drink, usually alcoholic.

• A title, name or header, a catchline, a short phrase or title to indicate the content of a newspaper or magazine story for editing use.

• (rarely used) the Imperial (English) unit of mass that accelerates by 1 foot per second squared (1 ft/s²) when a force of one pound-force (lbf) is exerted on it.

• A discrete mass of a material that moves as a unit, usually through another material.

• A motile pseudoplasmodium formed by amoebae working together.

• An accessory to a diesel-electric locomotive, used to increase adhesive weight and allow full power to be applied at a lower speed. It has trucks with traction motors but lacks a prime mover.

• (television editing) A black screen.

• A piece of type metal imprinted by a linotype machine; also a black mark placed in the margin to indicate an error; also said in application to typewriters; type slug.

• A stranger picked up as a passenger to enable legal use of high occupancy vehicle lanes.

• (District of Columbia) A hitchhiking commuter.

• The last part of a clean URL, the displayed resource name, similar to a filename.

• A hindrance, an obstruction.

• A ship that sails slowly.

Meaning

• To drink quickly; to gulp; to down.

• To take part in casual carpooling; to form ad hoc, informal carpools for commuting, essentially a variation of ride-share commuting and hitchhiking.

• (of a bullet) To become reduced in diameter, or changed in shape, by passing from a larger to a smaller part of the bore of the barrel.

• To move slowly or sluggishly; to lie idle.

• To load with a slug or slugs.

  "to slug a gun"

• To make sluggish.