boner a dingo couldn't bite through

Used to describe an erection so hard that even a dingo (Australia's native wild dog) couldn't damage it.

Given the silliness of the expression, it's usually used to describe extreme enjoyment of an activity not related to sex, such as a sporting triumph.

When the Cats won the 2007 AFL Grand Final, I had a boner a dingo couldn't bite through for the next week.

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