Slang meaning : Language outside of conventional usage and in the informal register. Language that is unique to a particular profession or subject; jargon. The specialized language of a social group, sometimes used to make what is said unintelligible to those not members of the group; cant. A particular variety of slang; the slang used by a particular group. An item of slang; a slang word or expression. To vocally abuse, or shout at.