Merriam-Webster's Collegiate® Dictionary, 11th Edition
FLING
I. verb (flung; flinging)
Etymology: Middle English, perhaps of Scandinavian origin; akin to Old Norse flengja to whip
Date: 14th century
intransitive verb to move in a brusque or headlong manner , to kick or plunge vigorously, caper , transitive verb
1. to throw forcefully, impetuously, or casually , to cast as if by throwing , to place or send suddenly and unceremoniously , to give unrestrainedly , see: throw flinger noun
II. noun
Date: 1556
an act or instance of flinging,
2. a casual try or involvement, a casual or brief love affair, a period devoted to self-indulgence