It starts off with the odd merk every now and then. Then it starts becoming more frequent and before you know it you're merkin bare edz, bare manz; no one escapes a merkin. True merkaholic.
A Merkrat is a person or thing that has done some pretty thug or crazy stuff. A Merkrat can also be someone who knows how to mac it with the ladies. It can be used as an adjective or a noun. Most Merkrats do what they want and usually get away with it.