A group has called for a protest at Parliament on 8 October against legislation banning baring your buttocks.
The tongue-in-cheek event, scheduled one day after the full moon, calls for the right to bare bums.
Police said: "The only moon we want to see on Parliament House is the 8 day old moon in the October lunar cycle."
An amendment included in an overhaul of sexual offence laws specifically bans "mooning or streaking". First-time offenders face up to two months in jail while repeat offenders could spend six months behind bars.
Disgruntled mooners set up the protest as a Facebook event on Monday.
"Following the recent banning of the royal moon in Victoria, we have decided to show our [disgust] and [devastation] of this new law," the group said on social media.
However, Victoria Police responded asking the members to keep their pants firmly around their waist.
"We suggest keeping your pants on and shut this page down or potentially risk criminal charges," the Facebook post by Victoria Police read.

The Premier League team, who are on a two-game post-season tour of the United States and Canada, are scheduled to play Houston on Friday.
Several people have died and dozens have been injured following record rainfall over the weekend.
On Monday, hundreds of basketball fans were trapped inside an arena after an NBA basketball game.
Supporters were advised to stay in their seats overnight following Houston Rockets' win against Golden State Warriors in the NBA Western Conference Finals.
Many spent almost 11 hours at the Toyota Center, until the early hours of Tuesday morning.
Manchester City are currently in Canada, ahead of their match against Toronto FC on Thursday.

The Greek government is trying to balance austerity measures imposed by the EU and the IMF with a return to regaining economic policy-making power.
Greece has had two bailouts totalling â‚¬240bn (Â£188bn) since 2010 when private investors refused to lend to Athens.
Greece wants to return to market financing from next year.
"Taking into account the still fragile market sentiment and the many reform challenges ahead there is strong support for a precautionary credit line," said Eurogroup President Jeroen Dijsselbloem at a meeting of eurozone finance ministers in Brussels.
Greek Finance Minister Gikas Hardouvelis told the Reuters news agency he hopes for a grace period of up to a year after exiting the bailout, during which Greece will still get a financial safety net but would not be "micro-managed" by lenders.
The credit deal will use â‚¬11bn already granted to Greece by the eurozone to strengthen Greek banks. The money was not needed after the European Central Bank tested eurozone banks last month.
Victoria Police have urged Australian mooning enthusiasts to keep their pants on or risk criminal charges.
[NEXT_CONCEPT]
Manchester City's friendly trip to face Major League Soccer side Houston Dynamo is in doubt after flooding in the city.
[NEXT_CONCEPT]
Eurozone ministers have moved towards agreeing a new credit line for Greece as it prepares to exit its bailout at the end of the year.