The NSW Independent Commission Against Corruption made a corruption finding against the former Liberal minister on Wednesday and recommended seeking advice from the Director of Public Prosecutions about possible criminal charges.
The anti-corruption watchdog investigated the now independent MP for Drummoyne over his lobbying of local councillors to rezone blocks at Five Dock in Sydney, where his family owned property.
Premier Dominic Perrottet phoned his former colleague before flying to Japan on a trade trip on Wednesday night, demanding he resign from parliament - or face an expulsion motion.
Mr Sidoti says his response was brief.
"It was two words and I can't mention them on camera," he told Sydney radio 2GB on Thursday.
"It was words that aren't usually in my vocabulary," he said.
He maintains he won't resign from parliament, will "absolutely" prove his innocence and has instructed his lawyers to lodge an application in the Supreme Court.
"I've done everything I can in the last 11 years to wholeheartedly represent my community," he said.
The ICAC found Mr Sidoti misused his position as an MP to pressure and threaten City of Canada Bay Council Liberal councillors to rezone land to benefit his family's property interests.
Mr Sidoti hit back saying his business interests in the area were well known.
"It would be hard to find anybody in the area that did not know I had business interests" in Five Dock where his family owned a function centre.
"So the idea that somehow they didn't know or they lost their memory is just unacceptable," he said.
