The answer to any question that you don't know the answer to.
In many cases, it leaves the person in a state confused bewilderment when you answer with it.
A word used in place of "perhaps" whose only purpose is making the listener have to think about what was just said, and possibly throw the conversation in a completely different direction (because of its similarity to pap smear).
Joe: "Are we going to finish this job today?"
Chris: "Perhapsmear, it depends on how fast we work."
Joe: "...Dude..."