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2.
An acronym or an abbreviation for "unsatisfactory" made popular by the military, police officers, SPECOPS warriors, Sergeants, Range instructers, S.R.O.s, Krav Maga instructors & E.R.T. personnel the world over
The sergeant explained to the staff how the holster the new guy bought was unsat
by angryKarl February 14, 2011
 
1.
adj. Of poor quality. Lacking.

entemology: Thanks to the military's love for abbreviations and acronyms, unsat is shor for "unsatisfactory"
The plebe had unpolished shoes and a wrinkled uniform. The inspecting officer failed him and said he was completely unsat.
by Marc February 07, 2004
 
3.
A word that a dickhead former military guy uses when he can't speak like a normal human being.
(Former) (Sergeant) Dickhead: "Coffee without cream and sugar is entirely UNSAT."
by Tuhnesie July 18, 2011