n. (abbreviated CLS)

Generally referring to men who lift heavy weights on a regular basis. Chicken leg syndrome is a phenomena that refers to men who have huge upper bodies and very small legs, creating the appearance of a chicken, with a large breast and thin legs. This is caused by the immense amount of time and effort that they spend doing upper body exercises, and the lack of time that they spend on any muscles of their lower body.
The 25 year old could bench 400 pounds with ease, after years of training, but had never done a squat in his life. This caused him to develop chicken leg syndrome (CLS).
by Misha The Bear November 30, 2013
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