A person who tries to act like they know what they are doing even though they know don't have a clue.
A bluff bunny will lie about something in an attempt to not look stupid or uneducated; though all ways proving the ladder.
Bluff Bunny: "Can I borrow your clippers?"
Owner: "Do you know how to use them?"
Bluff bunny: "Ya! I'm not stupid"
Owner: "Why does my clippings brush have oil all over it?"
Bluff bunny: "I put some razer oil on the blade and spred it around, that's what you're suppose to do."
Owner: "NO! you stupid bluff bunny! The kit comes with a different, smaller blade brush, and it's for CLEANING not painting with oil!"