A giant lump on someone's foot. This bunyun is permanant and will never be able to be removed.
Mike: What's that thing on your foot, Cody?
Cody: It's my bunyun. Wanna touch it?
refering to paul bunyun. when you call some one a bunyun it means that they are striaght up gay. It means they are homosexual and they smell really bad (like garbage).
You: shut up you big bunyun.
other guy: why am i such a bunyun?
You: because you are striaght up gay.