Green’s Dictionary of Slang

trey-bits n.

[rhy. sl.; ult. trey-bit n. (1)]
(Aus./N.Z.)

1. the female breasts [= tit n.2 (1)].

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[Aus]Baker Aus. Speaks.

2. diarrhoea [= shits, the n. (1)].

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[Aus]G. Seal Lingo 91: trey bits means the shits.