American slang for a males testicles, made popular by Conan O'Brien.
My testicles itch, I mean my dolly bong bongs.
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1. A person who pretends to know everything about anything, but actually doesn't.
2. A person who interjects into a conversation with an unrelated and incoherent subject.
He says he can fix my computer but I think he is a cockjohnny.