[1965–70; freak1 + -ing2; euphemistically echoing frigging and fucking]This word is first recorded in the period 1965–70. Other words that entered Englishat around the same time include: Coriolis effect, double-book, genetic engineering, no-fault, overdub-ing is a suffix forming the present participle of verbs (walking; thinking), such participles being often used as participial adjectives (warring factions)