Green’s Dictionary of Slang

patsy n.2

[Patsy Riggir, N.Z. country music singer (fl.1980s), whose surname sounds like rigger n.]

(N.Z.) a container of beer.

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[NZ]McGill Reed Dict. of N.Z. Sl. 154: patsy jar or jug of beer. From Patsy Riggir, former queen of the local country music scene, whose surname sounds like the rigger or squarerigger, a nickname for the obsolete half-gallon jar.