verb

• (nautical) To pass a rope around (a cask, gun, etc.) preparatory to attaching a hoisting or lowering tackle.
• (slang) To sell, peddle, or distribute (often illicitly, e.g. drugs, sex, etc.).
  "You may know a lot about chemistry, man, but you don't know jack about slinging dope."

noun

• (weaponry) An instrument for throwing stones or other missiles, consisting of a short strap with two strings fastened to its ends, or with a string fastened to one end and a light stick to the other.
  "The Sling is also a weapon of great antiquity, formerly in high estimation among the ancients."
• (nautical, chiefly in the plural) A band of rope or iron for securing a yard to a mast.
• (climbing) A loop of rope or fabric tape used for various purposes: e.g. as part of a runner, or providing extra protection when abseiling or belaying.