interjection. Caution to writers: Not interchangeable with aaaaiiiieeeeeeeeeeeeeeeee.
Real citation: "My brother taught me a new expression the other day: 'hhhnnnnnnngggggg!!! It supposedly captures the feeling of ready-to-explode stress/agony/pain."
(Aug. 20, 2008, Around the Horn, http://web.cornell.edu/studentblogs/jennifer/)
Made-up citation: "Here's a word to sum up my week: hhhnnnnnnngggggg. Here's another: fuck-fuck-fuck-fuckity-fuck. Here's a third: Is murder a serious crime in this country? Because it would certainly resolve a few issues that are getting pesky, as they say in the buisness."