Spotted dick is a steamed suet pudding containing dried fruit (usually currants), commonly served with either custard or butter and brown sugar. Spotted refers to the dried fruit (which resemble spots) and Dick may be a contraction/corruption of the word pudding (from the last syllable) or possibly a corruption of the word dough. Another explanation offered for the latter half of the name is that it comes from the German word for "thick," in reference to the thickened suet mixture. There are many nicknames for a Spotted Dick including "Spotted Richard", "Dick in a box", "Dotted Lloyd", "Mixey Dick", "Dick with a dot" and "Dickie Burton" as well as many others. It is a cultural part of English Cuisine.
http://en.wikipedia.org/wiki/Spotted_Dick