in anal sex, this is the deeper part of the rectum where the colon begins. There is a muscle there that like the rectum has to 'open up' and for men who are endowed enough to reach it, feels like hitting 'the second hole' inside the first one.

A term often used by gay men
Let me open up that second hole with this nine.

That nigga with the big dick got all up in the second hole!
by BlkChicago79 March 30, 2006

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