Green’s Dictionary of Slang

(US) rubbish, nonsense.

1917		in E. Wilson Prelude (1967) 165: Hoy, bull [nonsense].
1918		Camp Wadsworth YMCA Gas Attack 8: If I have to listen to any more hoy about ’at gal I’ll desert.
1929		H.C. Witwer Yes Man’s Land 162: What kind of hoy is this?