The act of crossing the street, by foot, illegally (when that red hand says otherwise, or you simply aren't even at an intersection though one is only a few feet away). This forces you to to sprint at high speeds, forgetting about the friends you left on the other side, simply because you are fearing for your life. Generally causes regret mid-way, but turning back is not an option. Often times the phrase, "Let's bird-dog it!" Is yelled pre-crossing, or ,"I'm bird-doggin' it!" is yelled mid-run.
May also be called "j-walking".
"Dude, this light is taking forever, we're never gonna cross the street."
"There's a slight opening in traffic! Let's just start bird-doggin' it!"