Slugging 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 make sluggish. To hit very hard, usually with the fist. A blow or blows with the fist; a beating. The act of hitting a ball hard; slogging. The practice of smothering one's face with vaseline in order to moisturize it.