What is quaff?

This morning I decided to delight in a milk coffee ... And as I walk back to my desk I read the English on the label. It says, "Let's take a quaff of milky mild coffee! This is big in size and rich in taste!!"

So I ask myself, what is a quaff? I've never heard this word before. Have you? (It'd be great for scrabble if it was a real word, I think to myself ... )

I proceed to dictionary.com where I learn that *gasp* quaff is a real word, although it is mostly used as a verb, which this bottle clearly does not. (Unless I am failing English again, in which case I am sure James will correct me!)

Here are the definitions:
–verb (used without object)

1.	to drink a beverage, esp. an intoxicating one, copiously and with hearty enjoyment.

–verb (used with object)

2.	to drink (a beverage) copiously and heartily: We spent the whole evening quaffing ale.

–noun

3.	an act or instance of quaffing.

4.	a beverage quaffed.

(These noun ones kinda just sound like verbs to me...)

So next time you sit down with your milky coffee, I hope you quaff it.