(adjective) - (1) Soft and flabby . . . This is the regular word used by butchers to express the condition of meat which will not get solid, a very common fault in warm weather, or if the animal was out of condition when slaughtered.
--Henry Sweet's History of English Sounds, 1876
(2) Flaccid, soft; generally used of meat; Berkshire. Languid, limp, tired; Somerset. Tough; northwest Devonshire. Related to wang, to bend; to yield under a weight, as a plank when walked on; West Somerset. Hence wanged, exhausted, wearied, drowned.
--Joseph Wright's English Dialect Dictionary, 1898-1905