Webster's Revised Unabridged Dictionary · 1913

Slang

Slang , imperfect

imperfect of Sling. Slung. [Archaic]

Slang , noun

Any long, narrow piece of land; a promontory. [Local, English] — Holland

Slang , noun

[Compare Sling.]

A fetter worn on the leg by a convict. [English]

Slang , noun

[Said to be of Gypsy origin; but probably from Scand., and akin to English sling; compare Norw. sleng a slinging, an invention, device, slengja to sling, to cast, slengja kjeften (literally, to sling the jaw) to use abusive language, to use slang, slenjeord (ord = word) an insulting word, a new word that has no just reason for being.]

Low, vulgar, unauthorized language; a popular but unauthorized word, phrase, or mode of expression; also, the jargon of some particular calling or class in society; low popular cant; as, the slang of the theater, of college, of sailors, etc.

Slang , transitive verb

To address with slang or ribaldry; to insult with vulgar language. [Colloquial]
Every gentleman abused by a cabman or slanged by a bargee was bound there and then to take off his coat and challenge him to fisticuffs. — London Spectator