Welcome

I've been walking by a display of these things for a couple of weeks now at work, and they've always set my mind a wondering.

Is this something dirty? I realize that the hole is in the side of the girly pants because it is between the front and back pocket, but the belt looks like it is in the front with the 'Welcome' on a belt buckle, therefore placing the bird-hole in a very interesting location.

What are they saying with this thing?