Name you call someone (to their face) who is not very sharp and gets on your nerves. Richard = Dick, Whiskey = Liquor, therefore you are calling him a Dick Licker.
Melvin: Hi, I want to be your friend. I am really good at soccer and I have horrible breath too.
Brian: Hey now, richard whiskey, aren't you late for something. Scoot along now and I will talk to you later.
Melvin(thinking to himself): He really likes me. He made up a nick name for me...but what does richard whiskey mean?