If something is right up your alley, it is the kind of thing you like or know about. This should be right up my alley but, despite the film's special effects, I found it rather boring. I thought this little problem would be right up your alley. Note: You can also say that something is right down your alley. I'll need whatever information you can turn up within the week. This case seems right down your alley. Note: The usual British expression is right up your street.