Used to judge an idea. Means "is useful" or "has relevant meaning" or "is applicable" or "thats a good idea". dont know origin.
Example: in response to "We could try one more test." say "That has legs"
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Its a term in wine tasting for elite it refers to a certain action done to wine and then a moment of pause before examining the body of the wine.
It could be related to the aromatization of the wine.
The taste-tester was scouting if the wine got/has legs!
The wine savignonant knew he had a quality wine that got/has legs