A box of cow manure dumped on a premier's door has her steamed off but the state Liberal leader is standing by colleagues accused of orchestrating it.
A farmer made the delivery outside Premier Jacinta Allan's parliamentary office on Tuesday as a protest raged on the front steps over the Emergency Services and Volunteers Fund levy.
A note on the box read: "Dearest Jacinta, I have considered your levy and here's my feedback, it's bulls***. Love Brutus + family".
The vacuum-sealed dung package came wrapped in pink twine and with a photo of a cow attached.
Manager of government business Mary-Anne Thomas accused Liberal MPs Bev McArthur and Nicole Werner of facilitating the placing of the "offensive prop".
She has written to parliament's privileges committee to request an investigation into the pair for bringing "discredit" on parliament.
Ms Allan said the "disgraceful" behaviour would not be tolerated in any other workplace and wasn't funny.
"I spoke to the staff member involved and she told me how she felt unsafe," she told reporters on Wednesday.
Mrs McArthur, who is a shadow cabinet member, confirmed she was with the farmer when the package was delivered and described it as a "harmless stunt".
"Labor MPs are acting like they've never seen cow s*** before - maybe they don't get out of Melbourne much," she said in a statement.
"If they're genuinely more upset about a pile of manure than the total mess they've made of their budget and this state, it's no wonder Victoria's going broke."
The only way regional Victorians can get a message through to Labor politicians was to deliver a "bulls*** cake direct to their door", she added.
The premier challenged Opposition Leader Brad Battin to condemn the behaviour of his backers, who were key to him unseating John Pesutto in December.
Mr Battin repeatedly failed to do so but acknowledged it wasn't something he would have done.
He said he didn't have any knowledge of the stunt beforehand and would not say whether he had spoken to or reprimanded his factional allies.
"I will focus on the fact that I have spoken to so many farmers who are so angry out in the community," the state Liberal leader said.
"If this (stunt) changes the message and gets them (government) out to speak to them, then maybe that's a positive."
Mr Battin has pledged to scrap the expanded levy if the coalition wins government at the next state election in November 2026.
Tuesday's state budget confirmed the expansion of the levy from July 1 will raise an extra $2.1 billion in revenue over the next three financial years.
It is expected to generate $1.8 billion a year from 2026/27 to cover the responses of more emergency services.
"Active (Country Fire Authority) and (Victoria State Emergency Service) volunteers and life members will be eligible for a rebate on their principal place of residence, farmland or single farming enterprise," the budget papers say.
The Victorian government also promised partial rebates for drought-affected farmers and to lower the charge rate for primary production land.
