The feeling which occurs during prolonged ass cheek exposure to rotten, wet vegetation that manifests itself in an intense itching sensation, which gradually turns into unbearable pain. It feels thousands of needles raping your ass cheeks. Most commonly experienced by US Marine infantryman training in Okinawa, Japan during winter months.
Lance Corporal, can I get up to put on my gortex bottoms, I'm having severe jungle ass. There may actually be something in there biting me, possibly a jungle rat eating too many jungle budedas.