1. Any kind of act in which naked women are displayed or revealed.
2. Sexual entertainment in the form of lingerie, nudity, stripteasing, or dancing viewed from a private or semiprivate cubicle with a glass or two-way mirror.
3. In arcade days, a porno film that could be viewed through a coin-operated projection booth or viewer, usually in coin-by-coin increments. Synonym: peek-a-rama. Prior to that, in the early days of photography, the 1850s, a backroom where men, for a nickel, could view stills of naked and semi-naked women.
4. An exhibition of pornographic pictures viewed through a small hole or with magnifying glass.