tosh

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.

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.