oppo

noun2

1. •
   (US, informal) Research into one's opponent's family, friends, and past, which aims to uncover activities or interests which embarrass or discredit them.
2. •
   (UK, slang) A friend, associate or colleague.

   • 'I suppose you're referring to Fluker,' I told him, and he looked at me in stunned amazement when I explained that he was one of my old oppoes. — 2012