gilligan (hitch), n. — Green’s Dictionary of Slang

gilligan (hitch) n.

also gilligan guzzler

[US naut. jargon gilligan hitch, an out-of-the-ordinary or speedily tied knot/guzzle n. (1); Ersine, Underworld and Prison Slang (1933), suggests ‘Mr. Gilligan, an old-time strong-arm actor’]

(US Und.) a stranglehold.

1933		Ersine Und. and Prison Sl.
1949		Monteleone Criminal Sl. (rev. edn).
c.1955		D. Maurer ‘Lang. of Und. Pickpockets’ Lang. Und. (1981) 241: Gilligan hitch [...] A stranglehold (West Coast).
1972		N. Algren ‘The Last Carousel’ in Texas Stories (1995) 132: Swiftly applying a double scissor, a toehold, a half-nelson, and Gilligan guzzler with one hand.