Green’s Dictionary of Slang

bunker n.2

[euph. for SE bugger; however Irwin, American Tramp and Und. Slang (1931), suggests a ref. to a sailor’s bunk, wherein seaboard homosexuality takes place]

a sodomite.

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[US]Irwin Amer. Tramp and Und. Sl. 43: Bunker. – A sodomite or pervert.
[US]G. Legman ‘Lang. of Homosexuality’ Appendix VII in Henry Sex Variants.
[US]Monteleone Criminal Sl. (rev. edn).
[US]Guild Dict. Homosexual Terms 6: bunker (n.): A pedicator. (Tramp slang.).
[US](con. 1930s–40s) B. Rodgers Queens’ Vernacular 107: Hobo slang (kwn ’30s & ’40s) [...] The tramp who fucked his boy was known as a bunker and eye-opener.

In compounds

bunker-shy (adj.)

(orig. US prison/tramp) of a young man, orig, a prisoner, frightened of being forced into homosexual sex.

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[US] ‘Jargon of the Und.’ in DN V 441: Bunker shy, Adverse to pederasty.
[US]Irwin Amer. Tramp and Und. Sl. 43: Bunker Shy. – Afraid of being forced into unnatural sexual relations or in fear of a pervert. Usually said of a ‘prushun’ or ‘lamb’ not yet completely under the control of his ‘jocker’ or ‘wolf.’.
[US]B. Rodgers Queens’ Vernacular 108: A boy who turned on a tramp was a candy kid [...] Probably he would be bunker-shy, averse to homosexual coitus.
[US]Gaymart.com Queer Sl. in the Gay 90s 🌐 Bunker Shy – A young man who fears being forced into homosexual sex. Derivation from a 19th century prison term.