fangasm
n.— «It’s my second year at Con. I love it. I learned a new word: “fangasm.”» —“Comic-Con: ‘Torchwood’ and ‘Being Human’ get cheeky” by Hanh Nguyen Zap2it July 26, 2009. (source: Double-Tongued Dictionary)
Further reading
A Kentucky listener says her father often prefaced statements with the phrase I tell you what’s the truth. This regionalism appears in the Dictionary of Southern Appalachian English (Bookshop|Amazon). A shorter version is I’ll tell you...