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' (sot can mean a drunken person).
'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" .)