One is DAF after imbibing to such a degree of excess that communication in any human language system is rendered unreliable at best. All basic sense of social propriety dissolves into a chaos of impulses. The DAF individual is, in movement, reduced to little more than a quadruped and can only walk upright in the most severely erratic, uncoordinated fashion.
During the period when one is DAF, it is likely that one may sing (poorly), dance (frighteningly), cry (piteously), DEV (see definition), leer goatishly at others, or collapse by the side of a road.
For use when someone is wasting other people's time by asking questions about something that could be answered easily somewhere else (esp. a search engine of some sort).
"Before you come to this message board asking stupid questions, man, DAFS."
Your mothers cheesecake was daf. And the cherries, wow.
This weekend was daf. Capital D.