Term of mild disrespect used to describe bright, studious people, such as scientists, chess-players or spelling bee champions. Plural of brainiac. Synonymous with certain usages of brain, geek, nerd etc.
1: A British Television show that was bought by G4TV, which contains funny, stupid, and just plain unneeded science experiments. It often involves the use of breasts.
2: Someone who's life is dedicated to accumulation of all the world's knowledge.