RichThesaurus
pee on someone's cornflakes
vs
piss in someone's cornflakes
pee on someone's cornflakes
piss in someone's cornflakes
verb
To disappoint or irritate someone.
How often have the words
pee on someone's cornflakes
and
piss in someone's cornflakes
occurred in a corpus of books?
(source:
Google Ngram Viewer
)