"Bull feathers" is an interjection used to express disbelief. The concept is similar to "preposterous," which suggests that such an undeniable contradiction exists in the assertion being challenged that it cannot possibly be believed. In this case, the contradiction is clear: there is quite obviously no such thing as a bull with feathers.
Douchebag: You know, I got with this really hot chick last night and I'm totally not gay.
Critic: Bull feathers!
Critic: Bull feathers!
by Jaxson 5 May 9, 2009
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