Comical but frequently used insulting military jargon generally used to denote a lower ranking enlisted person whose uniformed appearance and/or job performance is substantially unsatisfactory ('un-sat'). A person who can be counted on to screw-up the most simple of tasks, and generally not entrusted to handle much more than the menial. Also utilized among civilan population albeit with far less frequency and familiarity; does not resonate with same defamitory impact as when used in military circles.
His shirt isn't ever tucked properly, shoes haven't been shined in ages and his haircut is barely within regulations-not only does he look like hell in uniform but he's terrible at his duties too, what a SHIT Bird!
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