1. To drink something (a fountain, sink, potion) in a hearty manner.
2. Usually used by people with an extended vocabulary, such as Edgar Allan Poe
1. You see here a fountain. 'q'
Drink from the fountain? (y/N) y
This tepid water is tasteless.
2. "Quaff, oh quaff such kind nepenthe .."
from The Raven