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Stands for Unauthorized Absence Light. Unauthorized absence, is punishable under article 86 of the Uniform Code of Military Justice (UCMJ). This refers to a traffic light which causes military servicemen and women to arrive late to work (or formation) due to the longer than normal time for the light to turn green.
Sergeant: Why were you late this morning!?

PFC: Uh, I was stuck in traffic Sarn't...

Sergeant: I guess you got caught at the UA Light huh? Good, stand-the-fuck-by.
by RG3RM4N3L0CloakCloak3d January 28, 2010
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