horsefeathers

horse.feath.ers

n.(used with a sing. verb)（名词）（与单数动词连用）
Nonsense; foolishness.
胡言；愚蠢
interj.（感叹词）
Used to express disagreement or exasperation.
用来表示讨厌或气愤

来源：
Alteration of horseshit
horseshit的变化