Top Definition
A diaper that you wear at night (to bed) to prevent wetting the bed. In very strange cases they may be worn to prevent pooing the bed.
Fran has such a bed wetting problem that he wears a niaper to bed every night. He said it's saved him a lot of laundry trouble.
by quignugget May 02, 2010

The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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