from the Department of the Bleeding Obvious
Of such an obvious meaning or implication as to be completely redundant, superfluous, or unnecessary. Primarily heard in UK, Australia. Pauline: "The Prime Minister has said that lower-class families are bearing the brunt of the recession worse than anyone else." Johnny: "Wow, any other riveting news from the Department of the Bleeding Obvious?"
in the trouser department
1. Literally, relating to or having to do with trousers or pants. Of course, in the trouser department, a nicely fitted pair of slacks will always look more respectable than tracksuit bottoms.
2. slang Relating to or concerning a man's penis or its physical aspects. Look at that guy in his big flashy sports car. I reckon it's compensation for not having much in the trouser department, eh?
be (not) (one's) department
To be one's area of expertise or responsibility. I can't approve expense reports—that's not my department. Car repair is my dad's department, so he should be able to help you out.