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Rubber Coin Slot 

The anus. Derived from a certain scene in Spongebob where two characters tried to shove a coin up a seahorse's ass, thinking it was a coin slot for a kiddie ride. See Chocolate starfish or Leather cheerio.
My rubber coin slot is itchy but I can't scratch it or else my hand will smell like ass.

Dumpster Rubbing Her Slot 

Describes the female act of manual, clitoral stimulation, presumably to climax. Usually conducted unaided but can be enjoyed with the assistance of a trusted partner.
Check out this video of a hot chick "dumpster rubbing her slot all alone"!!!