Green’s Dictionary of Slang

Tipperary lawyer n.

[racial stereotyping]

a cudgel.

[Aus]Mercury (Hobart, Tas.) 4/3: [H]e produced a shillelagh — a real ‘Tipperary lawyer’ — and [...] proceedod to eield it in a defiant manner.
[UK]Farmer & Henley Sl. and Its Analogues.
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