21
A hot girl. Usually when you are in a crowd of a lot of people and you want to alert your friends when you see a good-looking chick that you'd bone.

Comes from: Fly (Bird) + Bitch (Dog) = Flybitch (Birddog)
Jeff: Birddog!!!!
Reed: Where?... Oh ya definitely a birddog, I'd smash!
by DougggSlater September 21, 2011
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22
In a gathering with some males and less females, the male who is socially unacceptable and thereby flushes females towards other males.
Poor Joe, he was the bird dog of the party last night. But at least I got some!
by Kirbyb September 19, 2005
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23
a term referring to someone who screws up all the time

(Made popular by a kid who fucked up 5 times in a row doing the "bird dog" drill
by BlackLavander November 20, 2007
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24
A sudden, unexpected tackle.
Usually in parking lots, bed rooms, parties, or near pools.
sometimes a bird dog is a friendly tackle, other times meant to do harm.
The most famous bird dog is performed in the movie "Old School" by Will Ferrell when he bird dogs a man into a fountain.. this is where the term originated.
After Bridgett stole Steve's seat, he was forced to Bird Dog her in order to get it back.
by Seth821 November 12, 2007
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