Used in army, and more commonly in the polive forces 13-69 is intended to sound, to a civilian, like technical jargon from police/army codes. 13-69 is actually a low-blow insult meaning unlucky cock-sucker. 13 being unlucky, and 69 being an obvious sexual posion. 69
"aw man, my wife kicked me out last night, can i stay at your place?"
"No way! it ain't my fault you're a 13-69"
U.S. Marine Corps slang for unlucky cocksucker.
Playing off of the 4 digit military occupational specialty (MOS) codes used. 13 being unlucky and 69 representing oral sex. Signifying an unusually distastefull assignment.
Iv'e been redesignated a 1369, stuck on mess duty for a month.