Soin
Exclamatory phrase which can be heard in the ghetto's of central London. 
Originally used to portray joy, it is now often used in a derogatory context.

Source: Mcfly3004, London
asbo1: Ive just landed a job at McDonalds!
asbo2: Soin!, well done mate
or
asbo1: You smell like bum
asbo2: Sod off soin boy