Green’s Dictionary of Slang

1. an ageing roué.

1884		Sporting Times 12 Jan. 5/2: An irrepressible old josser, who accepts eight separate invitations for lunch on Friday.
1889		Nat. Police Gaz. (NY) 7 Dec. 11/2: Slavin will have a strong corner, for the men behind him are not by any means Jossers .
1899		Crissie 49: ‘He’s just the josser to trick you out in diamonds’.
1908		Sun. Times (Perth) 9 Aug. 1/1: The elderly josser expects his bridelet to twiddle her thumbs and gaze on his battered beauty.
1910		Truth (Perth) 9 July 7/8: That there gurl, half starved and sore / Gave her soul up to the Josser / Who had axed of it afore.

2. (also joss) a swell, a grandee.

1890		Punch 22 Feb. n.p.: These quality jossers would spile it, if ’arf their reforms they can carry [F&H].
1897		Melbourne Punch 25 Feb. 4/4: I once heard a josser sayin’ that exooberance was what / Was the matter with such larrikins ez Bill.
1903		Sun. Times (Perth) 26 July 1/1: The jumped-up joss received a Perth penwoman à la buck navvy.
1909		J. Ware Passing Eng. of the Victorian Era.

3. (Aus.) a clergyman, a minister.

1889-90		D. Sladen in Barrère & Leland Sl., Jargon and Cant I 507/1: Josser [...] (Australian popular), a priest, the Chinese temples being called ‘joss-houses’ or ‘josses.’ Australian slang designated those who ministered in them jossers, and then extended this term it had created to mean ministers of any religion.
1890–1904		Farmer & Henley Sl. and Its Analogues.
1941		Baker Popular Dict. Aus. Sl. 40: Josser, a parson.