When 'ghost' means 'very' in Cantonese

In Cantonese, whenever we want to say 'very', we can always use 'kuai' which originally means 'ghost'. The following are the examples with 'kuai' meaning 'very'in the phrases:

a) Kuai kum hou seik (Very delicious)
b) Kuai kum chou (Very noisy)
c) Kuai kum leng (Very pretty)
d) Kuai kum yun (Very far)
e) Kuai kum yi (Very easy)
f) Kuai kum cheong (Very long)
g) Kuai kum fei (Very fat)
h) Kuai kum sar chan (Very arrogant)
i) Kuai kum pheng (Very cheap)
j) Kuai kum kuai (Very expensive)