suicide headache
n.— «Cluster headache (CH) remains an enigma to the medical profession.…Many chronic CH sufferers eventually take their own lives—earning CH the gruesome moniker “suicide headaches.”» —“LSD cured my headache” by Arran Frood Independent (United Kingdom) Oct. 7, 2008. (source: Double-Tongued Dictionary)
Further reading
A flashlight doesn’t flash. It provides a steady beam of light. So why is it called a flashlight? The earliest versions lit up only briefly before the batteries gave out and required a recharge, so they were literally “flash lights...
Penny in Savannah, Georgia, recalls that her father, a Navy veteran who served in the South Pacific, would say of someone who was clueless or didn’t know what he was talking about: That person doesn’t know if he’s punched, bored...