Top Definition
When a sheet is hung from the upper bed on a bunk bed, the lower bed is obscured by the sheet, thus creating a fapcabin.
Ben- "What are you doing?"
Ryan- "Hanging a sheet from your top bunk bed."
Ben- " Ohh okay. So you're making a fapcabin!"

Later that night-
Ryan- *fapfapfapfapfapfap*
viết bởi lordwhoopass 06 Tháng tư, 2013

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also known as a "fortress of solitude", an area where one can masturbate undisturbed. Fap cabins are usually outfitted with pinups or other fapping enhancements.
a bathroom, shower, car in the driveway, man cave, or secluded work desk.

"My fap cabin is covered in pictures of Hope Solo, and plays Alicia Keyes music on repeat."
viết bởi kyldonia 06 Tháng hai, 2013

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Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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