An assumed contempt or indifference to the unattainable. (See above.)
“There, economy was always `elegant' and money-spending always `vulgar' and ostentalous- a sort of sour grapeism which made us very peaceful and satisfied.” —Mrs. Gaskell: Cranford, chap. i.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894