I see Wong Gam Lui Ching has picked up a few things from her stay in Hong Kong.
To kick it up a notch, try "Throw your mother's old shoe". Translating it into Cantonese yields something that sounds similar to... "fuck your mom's smelly cunt".
Updated
(FUCK YOU!)
Diu lei loumou!
[diu2][nei5][lou5][mou5].
Literally "Fuck your mom". The most infamous Cantonese expletive.