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A cat's anus, usually one that is obvious, such as on a black short haired cat.
As Fluffy walked away, his pink button glistened in the moonlight.
by Kitteniest April 25, 2006
Another term for the clitoris

Also used as stay awake pills!
Some people's whole clothes are made from pink buttons!
by lukeh March 20, 2005
Another term for clitoris
I wanna lick your pink button
by DizzyLizzy January 19, 2007