Definition of "looper"

looper

/ˈluːpə(ɹ)/

noun
plural loopers
1. An instrument or tool, such as a bodkin, for forming a loop in yarn or cord, etc.
2. A moth having a caterpillar which arches its body into a loop in order to bring the back part of the body forward as it walks due to having fewer prolegs, including inchworms or measuring worms in the family Geometridae and some species in the family Noctuidae.
3. A (usually electronic) tool for creating music loops.
4. (baseball) Synonym of blooper (“a fly ball that is weakly hit just over the infielders”).
  Quotations
  With one out and runners on second and third, Cavan Biggio hit a looper up the middle that eluded hustling shortstop Tim Anderson in short centre field.
  2022 June 22, Jay Cohen, “Blue Jays' woes continue as Harrison's walk-off single in 12th inning wins it for White Sox”, in CBC News‎, archived from the original on 2022-06-25
5. (slang) A golf caddy
  Quotations
  "There ain't much to tell. I'm the king of the caddies, the greatest fucking looper who ever packed a bag."
  1981, James Ellroy, Brown's Requiem
  "Carl Spackler: So I jump ship in Hong Kong and I make my way over to Tibet, and I get on as a looper at a course over in the Himalayas. Angie D’Annunzio: A looper? Carl Spackler: A looper, you know, a caddy, a looper, a jock."
  1980, Douglas Kenney, Harold Ramis, Brian Doyle-Murray, Caddyshack