1) Someone is unqualified for something, or someone who could not qualify for something.(Used in USMC and U.S. military.)
2) Someone who failed at something. Abrieviated for Unqualified.(Pronounced Unk.)
1) Smith could not qualify on the rifle range so he is an Unq.
2) You're such a waste of life you're an Unq., you're unqualified to live.