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A fancy way of being a total pain in the arse. Usually done by posh people who think they're clever.
'I'm doing obnoxiety now,' he said, while trying to get his tie straight and talking about how he 'used to be a barista.'
She called her annoying friend 'a walking obnoxiety' during a group project.
The teacher said, 'If you're not paying attention, you're doing obnoxiety.'