Green’s Dictionary of Slang

1. (gay) a heterosexual man [? abbr. for just a man, but this may be a camp joke and the real ety. is unknown].

1964		Lavender Lex. n.p.: jam:– Persons who are totally ignorant of the homosexual and his world.
1964		Homosexuality & Citizenship in Florida 23: Glossary of Homosexual Terms [...] jam: Normal person. Sometimes used to designate a normal person who is understanding of the ways of homosexuality but who is untouchable for trade or anything else.
1965		Guild Dict. Homosexual Terms 25: jam (n.): Any non-homosexual male; it is said that the word found its meaning from the abbreviation of: just a man. The term is more often used on the West Coast of the U.S.A. than in the East.
1979		Maledicta III:2 244: Heterosexuals, outsiders, jam, normals, squares, BMs (‘baby-makers,’ Cape Town), and general naph omis.
1989		J. Morton Lowspeak.
1999		Gaymart.com Queer Sl. in the Gay 90s 🌐 Jam – A term used in the mid-twentieth century to denote straight people.

2. (Ulster) a second-rate teacher [abbr. junior assistant mistress].

1997

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