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*
af lordwhoopass 6. april 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."
af kyldonia 6. februar 2013

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