"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!
A person who wears a bullfeather is a person whose wife or girlfriend has cheated on him. The term comes from the "horns" on a cuckold -- the horn being the closest thing a bull has to a feather.
Just about any joke involving horns was considered hilariously funny through the 19th century, because everyone knew it meant the guy was a fool who was being cheated on -- the worst social disgrace for a man of that era.
John's wife is having an affair with Peter Quincy -- can't you see the bullfeathers on his head
Richard's girl sleeps with every guy in town. What a bullfeather he is!
slip of the tongue perhaps,
Those idiots who drive around in a ridiculously raised pick up truck, making a top heavy vehicle even more top heavy and unstable
A:*gah*
B: "Whats the matter"
A: This dam prickup is blinding me.
B: Stupid thing's, as if there lights weren't blinding enough as it is.
Someone who jumps from one relationship immediately into another one.
Serial monogamists can not stand to be alone and often suffer from vast commitment and insecurity issues.
Because they jump into relationships immediately after the previous one has ended, serial monogamists typically don't take the time to reflect on their behavior or why their previous relationships failed; thus, they end up making the same relationship mistakes over and over again.
Person 1: Damn, Dustin already has a new girlfriend?! It's only been two weeks since he broke up with his fiance! I think he's a sociopath.