Mermie stands for Male equivalent of rat made in Europe. This is Online slang that is
popular on apps like
twitter and
tumblr in recent years. It's often used to describe whorish guys in Western Europe, some who pretend to be women online for clicks and ego fueling privileges. If u know where to look, they're often on twitter with fan pages of some of the greatest acts of our day. Make sure to call a Mermie every time you see one, as it is a compliment to them.