tosheroon

Etymology

From 19th-century British slang, developed from or alongside tusheroon, of uncertain derivation from British slang caroon (“crown, a 5-shilling silver coin”), from Sabir and (originally) Italian corona (“crown”). The term was either derived from or influenced by madza caroon, the British slang for the Sabir and Italian mezzo corona (“half-crown”), possibly under influence from tosh (“copper items; valuables”) above or from the half-crown's value of two shillings & sixpence.

noun

1. (Britain, archaic slang) A half-crown coin; its value
   tush or tosh. Money: Cockney: late C.19–20. Ex: tusheroon... But H. errs, I believe: he should mean half-a-crown, for tusheroon and its C.20 variant tossaroon (2s. 6d.) are manifest corruptions of Lingua Franca MADZA CAROON. 1961, Eric Partridge, The Routledge Dictionary of Historical Slang
2. (Britain, obsolete slang) A crown coin; its value
   Half-a-crown is known as an alderman, half a bull, half a tusheroon, and a madza caroon; whilst a crown piece, or five shillings, may be called either a bull, or a caroon, or a cartwheel, or a coachwheel, or a thick-un, or a tusheroon. 1859, J.C. Hotten, A Dictionary of Modern Slang, Cant, and Vulgar Words
   ‘Tush’, for money, would be an abbreviation of ‘tusheroon’, which in old cant, and also in tinker dialect, signified a crown. 1912, J.W. Horsley, I Remember, xii. 253