Cough Cool
Sorry Glenn Danzig: There is nothing cool about coughing.
I have been listening to this song for about a decade, and I still don’t think coughing is cool. Here are some alternative ideas to what he is singing about:
It is some kind of command that one says to their companion when checking out a couple of attractive half-elves: “Hey, Bildor, cough cool and see what happens.”
It is a magic-user cantrip that allows the apprentice to expel a refreshingly cool breeze from her mouth.
It is the name of lesser-known halfling sheriff, CoughCool Brambleweed
When repeated several times, it becomes the verbal component to magic mouth: coughcoolcoughcoolcoughcoolcoughcool

Coughing=uncool