What is Jack-a-leg?
1.
A total, complete doofus who just can't seem to get anything right, ever. Can also be used to refer to an animal, such as a dog, who acts totally off-the-wall, unpredictable and sometimes anti-social.
That goddam black catahoula just went after my neighbor's friendly dog. She can be such a jack-a-leg sometimes.
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7.
(v.i.) Out to lunch; not having it together; acting in a stupid way. Typically derogatory.
Derivation: ..
