Green’s Dictionary of Slang

TR n.

[‘a tunnel ram is an aluminium high-performance manifold, designed for race-cars, that sits atop a V8 engine’ Looser (2001)]

(N.Z. prison) a sexually active woman, a ‘tunnel ram’.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 192/2: TR abbr. a promiscuous woman.