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An extremely large boner that is not able to be hidden under any circumstances. Approximately 9001 times the size of a Nathan.

see definition Nathan

A term used to describe an especially perky boner in public that is unable to be hidden.
"Sam, I was in the office reviewing papers when I noticed a female who had an incredibly attractive body. I instantly had a Nathan, and when she turned around, her face was just as magnificent as her body, at which point my Nathan turned into a BIG BIRD BONER."
by Flibbert February 03, 2010
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