"Daup" is not a word.
Don't ask me why; I always thought one "dauped" canvas (you know, before painting on it, or after stretching it across a wooden airframe).
Nope, it's "dope."
And interesting to me is that "dope" meant "a goopy stuff you use to coat other stuff" long before it meant drugs. And in fact, it makes sense that illegal drugs would be called "dope"--since illega. drugs are a goopy stuff you use to coat other stuff.
You learn something new every day.
Is there a word you always believed existed?