Raj is a slang term used in the North of England to say someone is a bit mad, crazy or does stupid things, knowing that they are stupid but do them anyway.
Raj (slang) 'What are you doing ya Raj git? could have got someone killed!' or 'You see him over there?! he headbutted the doorman last week the Raj git'
by Riff Raff 1950 January 03, 2018