Top Definition
a phrase that you can tell some one when they are being so perfect. since you don't feel like using the whole word "perfect" you use this phrase.

can also describe a human being/inanimate object and can replace someone's name.
i just ate a thousand candy bars.
omygod. that's so perfy derfy.

hey looks it's perfy derfy!
where?!?!
over there! by the perfy derfy mailbox.
wow. such a perfy derfy.
by perfyderfy queen. February 09, 2011

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