bushwah · noun1
Uncertain, first attested in the 1900s. Perhaps from dialectal bodewash (“dried buffalo dung”) or by Etymology 2, from bourgeois. Subsequently used as a minced oath variant of bullshit, though bullshit itself is only attested from the 1910s.
bushwah · adjective2
From bourgeois.
Etymology from Wiktionary, CC BY-SA 4.0.