boner eclipse

When tucking ones penis between the legs, and one achieves an erection, causing said hard penis to poke at the anus of said tucker, creating a condition known as a boner eclipse.

See also fuck your ass.

Bill: I got a boner eclipse the other day.

John: What the hell is a boner eclipse?

Bill: Where your dick goes so far up your ass it turns into a boner eclipse.

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