She hates that kind of sleazy guy at dinner parties.
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The slang sense of 油腻 went viral in 2017 via a Feng Tang essay listing traits of 'greasy' middle-aged men: pot belly, beads, pretentious wisdom, unsolicited advice. 油腻男 crystallized as the stereotype.
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Internet slang, informal, somewhat mocking. Female counterpart: 油腻女 exists but is rarer.