Two of my GC use the word "squit", which in my book refers to loose stools. They use it in relation to stuff on the TV that is rubbish. I think it is very funny - I am sure that either Mum or Dad has groaned at them watching rubbish and called it squit. The rule at my house is that they can watch TV at specified times, but no squit, which mainly refers to Youtube videos of American children doing silly things. Apparently it is irresistible!
To think that London, or anywhere else for that matter, does not belong to any one demographic