Growl is a low-pitched, guttural singing style, usually used by the singers of the death metal genre. It can also be heard in other types of heavy metal. They are low-pitched, guttural and typically hard to decipher. Also called a death grunt, death growl, or death vocal. Idiots might generally refer to it as "cookie monster vocals". But those are just that: idiots, and should be taken as so.

when you're hungover as shit after a spending a night drunk as a skunk

The noise you make when you are pissed, or aroused.

the deep and meaningful sound that erupts from the mouth when you are doing something that stimulates you.

A collective of lesbians

cunnilingus, in the same way a hummer is fellatio.

If you growl while eating pussy, it creates an interesting vibration sensation for her.

Plus, it's difficult to talk when eating pussy, so just grunt & growl with pleasure & she'll be happy!