Questionable actions (specifically those of loose women or women lacking a strong moral fiber) that take place anywhere tincans and/or various other debris are present.
<i>walking up Limestone with Mattbro1 after breakfast at Tolly Ho's after work</i> - "Wonder what kind of tin can sluttery goes on here after the bars close?"
the act of double-penetration in a single orifice, usually the vagina
The exact origins of the Turkish can opener are unknown, but I did this last weekend, so we could say that it started there, for historical purposes.
Girl: Owee!!!
Other Girl: WTF mate?
Girl: I'm in major pain, my BF and his BFF did a Turkish can opener on my snooch last night.
Other Girl: Ooh, what's a Turkish can opener?
Girl: One cannot be told about a Turkish can opener. You have to feel it for yourself.