I am from England, and I have never heard anyone say the following......
Cacophony (Never heard that word before) Frothy, Purulent or residual.
The word Nincompoop made me laugh, my Nan used to say that to us when we were small and had done something silly :-)
The word I hate the most is 'Sick' simply because kids today (My 13yr old included) use it as a word for all things good. If they like something, they say "That is sick" or worse "That is Sickage."
Sick to me means vomit and there is nothing good about that :-)