bosh 
(bŏsh) Informal
(bŏsh) Informal n.
Nonsense.
interj.
Used to express disbelief or annoyance.
[Turkish boş, empty (popularized in English by its use in Ayesha, the Maid of Kars (1834), a novel set in the Near East by James Justinian Morier (1780-1849), British author); akin to Old Turkic boš, free, released.]