A bikeshed is a structure for holding bikes, and a slang term for debating minor points of a problem while ignoring the important issues. Also known as Parkinson's law of triviality. Bikeshedding should be avoided, and is a hackerspace anti-pattern.
Extended discussion of one topic, although often boring and pointless, is not necessarily bikeshedding.
Bikeshed may also refer to the LHS Bikeshed, a starship simulator in a caravan.