From 19th-century British thieves' cant, of uncertain origin. Sense of nonsense possibly influenced by tush attested from 15th century.
Compare Old French tonce ("shorn, clipped") and English tonsure.
From 19th-century British slang tosheroon, from or alongside tusheroon, of uncertain derivation from British slang caroon, 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 mezzocorona, possibly under influence from tosh above or from the half-crown's value of two shillings & sixpence.
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