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.
Person: Wanna go get some food?
You: Perhaps.
Person: Hey, do you know what the time is?
You: Perhaps.
The state, usually of the female gender, in which the person seems to be permanently upset or pissed regardless if there is really anything wrong or bothering them.
Sally always walks down the street with a frown on her face and arms crossed. She is is definitely permapissed!
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..."
The true more devious form of saying maybe while having some class. It still makes you a douche bag if you don't confirm your answer. Ellipses add extra confusion just to mess around.
Fred: "Hey, wannagrab some drinks tonight?"
Bill: "Perhaps..."
Fred: "Is that a yes or no though?"
...