Green’s Dictionary of Slang

1. a strong drink.

1838

cited in Partridge DSUE (1984).

2. an assistant, e.g. on some form of delivery vehicle.

1872		Sportsman (London) ‘Notes on News’ 20 Jan. 4/1: It would seem, from definition of the ‘trouncer’s’ business, that the driver of a coal-waggon is a ‘gentleman’ that requires to be treated somewhat ‘gingerly’ [...] if he is unable or unwillmg to perform his duties, he hands his vehicle over to the ‘trouncer,’ who takes charge of it for him.
1913		Eve. News (Sydney) 3 July 11/4: ‘I’m a ‘trouncer’ sir; I helps my mate on an ice van’.

3. (Aus.) a highly capable or expert individual.

1941

Baker Popular Dict. Aus. Sl.

4. something amazing or astounding.

1941

Baker Popular Dict. Aus. Sl.

5. (Ulster) an attractive woman.

1997

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