Green’s Dictionary of Slang

horse-collar n.

[supposed resemblances]

1. the vagina, esp. when considered larger than average.

[US]Wkly Rake (NY) 30 July n.p.: wants to knowWhat Neil Gallagher means by a ‘horse-collar’.
[UK]Cythera’s Hymnal 34: A cunt large horse-collared and wet.
[UK]Cremorne III 78: A fat lump with bubbies as big as an Alderman’s arse and a cunt like a horse collar.
[UK]‘Walter’ My Secret Life (1966) VI 1256: I stopped her progress to see the horse collar from behind. A great, heavy, pouting lipped article it looked.
[UK]Farmer Vocabula Amatoria (1966) 155: Harnais, m. [...] 2. The female pudendum; ‘the horse collar’.
[UK]‘Ramrod’ Nocturnal Meeting 86: Some women I have fucked [...] have had cunts like horse-collars.
[Aus]B. Humphries Barry McKenzie [comic strip] in Complete Barry McKenzie (1988) 88: Cut the cackle and hop into the horsecollar.
[UK]B.S. Johnson All Bull 233: My sister has a hole like a horsecollar.

2. (US) a zero, esp. in sport, thus a negligable individual.

[US]Nat. Police Gaz. (NY) 29 May 14/3: Last year Clarkson was a king and McCormick a horse collar in the eyes of the Chicago club management. Mack felt the sting but said nothing.
[US]E.H. Babbitt ‘College Words and Phrases’ in DN II:i 42: horse-collar, n. Another name for the cipher when indicating the score of a game or the mark of a student.
[UK]Post (Lanarks) 23 Apr. 6/3: Horse collar — zero.
[US]M. Avallone ‘Power the Ball Platewards’ in Super Sports [Internet] Both of the rival hurlers were handing out horse collars to the opposition.

3. (Can./US) a clerical or man’s high collar.

[Ire]Joyce Ulysses 693: He had a nice fat hand the palm moist always I wouldnt mind feeling it neither would he Id say by the bullneck in his horsecollar I wonder did he know me in the box.
[UK]J.P. Hurstone Piccadilly Ambulator I : .