One form of slang, well know in the UK is called Cockney Rhyme or London rhyme.
Here are a few examples:
Apples and Pairs = Stairs.
eg "Have you seen James recently. Yes I passed him the other day on the apples and pairs"
which translates to : Saya melewatinya di tangga
Dog and Bone = phone
eg "Have you spoken to your mother yet. No, but I will call her later on the dog and bone later'
Saya akan berbicara dengannya nanti di telepon
Hope that helps!