now I feel like an obnoxious anime fanboy for that ^_^ well, shounen means young man or a kid, so shounen anime is animated shows aimed to younger male audiences, These shows are heavily based on action most of the time, well they are for guys anyway. The opposite (so to speak) genre is shoujo, which is, you guess it, shows aimed at girls, and these are more focused on romance or relationships than action.
One wise person sometime said that if you know the equivalent for a foreign world in your own language you shouldn't use the foreign one, but saying "young men animation shows" sounds kind of weird, heh.