Bikeshed refers to topics which have never recieved concensus and are likely to generate side-discussions and flames unless all participants are well-read on all the past history. It stems from the idea that big changes (like the building of a power plant) go through quickly, since everyone assumes that someone else has checked it out, while simple changes (like building a bikeshed) often get mired in bureaucracy, since everyone has an opinion on it.

Where kids go to smoke during break at school.