Listen Up Guys: The Untuck

I want to have a quick talk about un-tucking your shirts. I have seen you doing it, and I have seen it done well and not so well. Here's the deal.
Do NOT, untuck a dress shirt that is meant to be tucked in, you can tell because it will be too long and look too stiff and boxy to be hanging out. If you bought it in the work-ish section of a store than you should probably not leave it un-tucked. Girls can tell the difference so you'll need to familiarize yourself.
Next, do NOT untuck a shirt and also wear baggy-ish jeans. They will need to be tighter (they don't have to be skin tight) just more fitted and preferably in a darker wash ok?
That said, you can tuck in wrong too. If you have jeans that ride a little higher on the waist and then tuck in with a belt, you will look like Erkel.
Above and below are some visuals. I hope this helps.

Below is a NO-NO. you can see that even with jeans this guy would still look like a dork.