To have the properties of being fast, similar to avian vertebrates; to be fast, like a bird.
He ran birdly down the hall, easily outrunning me on my scooter, while yelling, "I'm FAST, like a BIRD!"
by J-Wilde January 17, 2011
The quality of being reminiscent of a bird.
Ashlee Simpson used to be birdly - before her rhinoplasty.
by orchislily October 23, 2006