"What a drag!" (3)
(Other definitions for ugh that I've seen before include "Kind of hug - it's disgusting" , "Exclamation of disgust arising from hug" , "expression of revulsion" , "Disgust in thought" , "That's disgusting!" .)
'what a drag' is the definition.
(toke is a kind of drag)
This is the entire clue.
(Other definitions for toke that I've seen before include "A drag" , "Draw on a spliff" .)