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"
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