noun

• (Australia, New Zealand, British, Ireland, informal) An engineer or scientist, especially one engaged in technological or military research.
  "In fact, a fighting friend of mine said that he could hardly walk in any direction in this war without tumbling over a scientist who had got in the way. In the Royal Air Force, where the concentration of scientists is perhaps greatest, they have a pet name for them. They call them “Boffins.” Why, I do not know. I said to a young friend of mine in the Air Force, “Why do you call scientists ‘Boffins’?” He said, “I don’t know. What else would you call them?”"
• (Australia, New Zealand, British, Ireland, informal, by extension) A person with specialized knowledge or skills, especially one who is socially awkward.
  "— Well, last year I used to have a friend Charley [Charley was in the top sets for English, mathematics and French] but this year he doesn't speak to me any more and every time I see him he's hanging around with boffins like. When I go round to his house, now and again, he's always got his 'O' level and 'A' level books open and he's always concentrating on his work. Hanging around with boffins. / — What are boffins? / — People who work. Stay in all the time. Never go out, go down the town or nothin. And always get good letters home and pats on the back by teachers."
• (Australia, New Zealand, British, Ireland, informal, by extension) A person with specialized knowledge or skills, especially one who is socially awkward.