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1.
When you ram your rod into the fertile sod of a broad, specifically in her butthole and you withdrawal faster than the french at a war meeting her butthole will resemble a birdhouse's hole. You stare magnificently at what you have created, spit in or around it and then take a photo.
I was talking on the phone with my homie Z-Man and he was telling me about this dude that birdholed this girl and her butthole wouldn't close.

or

If engaging in an anal invasion, a woman's ass elasticity will manifest itself as the ubiquitous birdhole.
by gauchacj February 25, 2011