Fapfolder, a folder on your
desktop computer or camera filled with pictures used mainly to
masturbate on.
May include nudes and semi-nudes, but can also include pictures of people of interest fully dressed or even pictures of things unrelated to anything sexual.
Usually named something random or that won't draw any
attention like 'Submap 12' or 'fhiwufhiwefh' to make it less awkward when people see your desktop.