What is You You?
1.
Dublin method of adding a rogue 'you' at the end of an insult or statement, derives from Irish (Gaelic) method of putting second person singular after a verb. can be used with any insult but sounds funniest with ones which already end with 'you'. The second 'you' is usually drawn out a little longer.
"Shut up you you"
"Fuck you you"
See
