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A mischievous, risqué or sexy pair of underwear that stay concealed or hidden until an opportune moment arises to wear them.

When you save your best pair of panties or undergear for that right fuck.

Usually knickers that are racy, c-thru, frilly or elevate the bulge or pussy with a low sexy cut.
I woke up and caught my Dad putting on his naughty knickers that he keeps hidden in the closet.

I waited for him to leave the house and then told Mom.

My Mom clawed his eyes out and ripped his naughty knickers off and burnt them.

My Dad don't have naughty knickers anymore.

But my Mom still does :p
by The Moody Poet January 06, 2007
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