JDLR

Slang for "Just Doesn't look Right", Used by military/paramedics.
When someone is sick/wounded, usually pretty badly, but you just can't pinpoint the reasons/actual sickness for the problem.

The patient laid on the floor, a spotted tongue stickinv out and his skin looked a yellowish-green in tone. He had vomited 5 times by the time the paramedics got there.
Paramedic 1: "Gosh. What does he have?"
Paramedic 2 as he checks vitals: "No idea man. JDLR, we need to get him to the hospital ASAP