A more expressive version of "You're shit", employing the "aaaah" suffix made popular by Rhys Ifans in the movie "Twin Town". Often to be heard at UK soccer matches, hurled in derision at ineffective players.
"You're shit aaah!" shouted Eamonn at Joanne, again. She really was useless at football.
The worst 'Joke' you will ever hear. It might go like this:
Person 1: Hey you know how chicken tikka was made?
Person 2: No...
Person 1: It's 'ChickenTHICC AAAH'
Person 2: So you've chosen death
*Person 1 was never to be heard again*