Think before you post ??
No, but seriously, I used to have a problem with this too. You see, what's happening is that you're a bad self-monitor. Try this small exercise when talking to girls ... or people in general ... or whenever you go out for that matter: step outside your body. Imagine as if you weren't you that night and you were just looking at yourself ... from somewhere above, or just across the room ... and think what would you like to see yourself do at the moment. You'll automatically adjust your behaviour. Your body language will suddenly change, your speech will slow down, your moves will seem more graceful ... is essence, it will make you "smooth". Try it, see what it does for you. And also, don't forget to think before you speak. Take a break before you answer a question instead of saying the first thing that comes to mind (of course, not too long a break). Do that especially with girls, they have a knack of trying out "test" questions on you. Whenever they do that, I call them on it and tell them just how immature they are for doing it. So if you spot any of those "trick questions" just call them on it, or better yet, if you can think of a good comeback to put the spotlight on them instead, that's even better.