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.
Definition:
The Dirty Birdhouse-
When the man stuffs his asshole with cut up wheat stalks while stirring up a nice liquid shit. Then, the man will release his liquid shit and wheat strait into the woman's mouth. Following the explosion the man will facefuck the the woman. This my friends is The Dirty Birdhouse.
Used in a sentence:
No amount of toothpaste and mouthwash or combination of both can un-do The Dirty Birdhouse.
The act of trying to mate with the most attractive women at the bar often done through the use of excessive alcohol consumption. Usually accompanied by peacocking, mating calls, and showing strengths of manhood.