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Old-fashioned underwear (called long johns) used to have an actual flap in the back that covered up the butt - or that could be unfastened and let down so that you could use the outhouse (they didn't have indoor Plumbing back then either).

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15y ago
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15y ago

The rear opening on long underwear was sometimes called a buttflap.

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Q: What is a buttflap?
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