This is where a man is at the bar buying a woman drinks and another man swoops in and takes the drunk woman home for sex without spending a single dollar. While pulling a dirty bird one could add insult to injury by doing the infamous Atlanta Falcons Dirty Bird dance to celebrate.
If you are out at the bar and notice a dirty bird type woman accepting free drinks from another man, one could swoop in and pull a dirty bird on the dirty bird.
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