Green’s Dictionary of Slang

1. any coin, esp. a sovereign.

1905		A. Binstead Mop Fair 194: How to Give Monday Lunch for a Dozen without Spending a Tosser.
1926		S. O’Casey Plough and the Stars Act III: Which of yous has th’ tossers?
1938		G. Kersh Night and the City 201: I wouldn’t give yer a tosser for it.
1957		G. Kersh Fowlers End (2001) 268: A tosser on a Wilkie Bard, / A lord on a Charing Cross, / Is ’ow I fell, and it’s bread-’n-lard / To bear my milkman’s ’orse.

2. (Irish) a low-value coin.

1935		M. Harrison Spring in Tartarus 27: Christ, the de Launes hadn’t a tosser between them.
1946		D. MacDonagh Happy as Larry Act IV: Sure I haven’t a tosser to my name.
1950		S. Murphy Stone Mad (1966) 52: For all your scraping, you never have a tosser left after her.
1973		H. Leonard Da (1981) Act II: I haven’t got a tosser.
1980		E. Cooke Female Forms 104: She came home, sleepy-eyed, to porridge [...] She had no money. Not a tosser .
1992		P. McCabe Butcher Boy (1993) 80: Off he went in the rain and then back to his dingy old room just him and the cat and not a tosser between them.