Drunk now, whether you like it or not (2,5)
I believe the answer is:
so there
'whether you like it or not' is the definition.
(both can be said in defiance or stubbornness)
'drunk now' is the wordplay.
'drunk' becomes 'sot' (both can mean someone who drinks too much).
'now' becomes 'here' (I've seen this in other clues).
'sot'+'here'='SO THERE'
(Other definitions for so there that I've seen before include "Triumphant put-down" , "I defy you" , "What are you going to do about that" , "message of defiance" , "Defiant words" .)