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1.
Noun: Legs, usu. female, that are so thin that they resemble legs on birds.
My girlfriend is skinny and has bird legs.
by Kerb November 28, 2004
 
2.
A severe debilitating condition where a young beautiful girl suffers from legs similar in proportion and ratio of size to a bird. Very odd in description. No known cure. Stay strong GWBL.
Poor Allison has bird legs.
by NerdBird1 July 08, 2014
 
3.
1. Small, boney, non-muscular calves.

2. A person with insufficiently sized legs. Usually to announce a bird legs presence the phase "chirp chirp chirp" is uttered.
Don certainly has some bird legs on him doesn't he?
by Meatloaf666 March 04, 2012