bosh UK /bɒʃ/US /bɑʃ/exclamation 2noun 4verb 1forms 3 exclamation2 •(UK) An expression of disbelief or annoyance."Bosh!" said the Vicar, rejecting the hint altogether. — 1904 •(UK) An expression of speedy and satisfactory completion of a simple or straightforward task.Wrong, get a^([sic]) LPG diesel. More power than either, better economy than either, bosh, job's done. — 2003 noun4 •(UK) Nonsense.Tho' hundreds cheer his blatant bosh, He's but a goose for a' that. — 1868 •The lower part of a blast furnace, between the hearth and the stack. •A fiddle (musical instrument).My father broke his bosh one night when he was in Waterford. — 2009 •(slang, no longer used) A figure. verb1 •(UK, slang) To consume (illicit drugs).We boshed two grams each of the beast 10, and then we went downstairs. — 1996 formsboshed · boshing · boshes