Green’s Dictionary of Slang

fifteen n.

(Aus.) a 15 ounce beer glass; a serving of beer in such a glass.

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[Aus]J. O’Grady Gone Troppo (1995) 51: ‘A seven o’ beer,’ Bill said. The Boss said, ‘Bum. Give him a fifteen. He’s from the Territory; there’s a drought out there’.

In compounds

fifteen-watt (n.) [‘a dim bulb’]

(N.Z. prison) a notably unintelligent skinhead.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 67/2: fifteen watt n. an unintelligent skinhead.