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1.
1. the act of pandering to one's own pretensions by making an excessive fuss over the quality of wines at a party.
2. wine wankery.

Origin: 2007; Gk oǐn(os) wine + after Onan, son of Judah (Gen. 38:9)
"The importance of the difference in taste between a two-year-old Portuguese douro and a two-year-old Portuguese dão can only be fully explained by an expert in oenanism, desperatetly trying to score at a houseparty at 2.30 in the morning."
by Ronan Hodson June 11, 2007