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*
de lordwhoopass 6 avril 2013
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."
de kyldonia 6 février 2013

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