Victorian criminals have taken to classifieds website Craigslist to openly buy and sell drugs and counterfeit money.

Melbourne's Craigslist featured more than 150 posts about selling illegal drugs last month, including cocaine and ice, News Corp reports.

The drug requests are said to be hidden behind street slang, such as "Mary" for cannabis and "looking for Lucy" for LSD, and are usually accompanied with a preferred pick-up spot and price.

Some brazen dealers even leave mobile numbers for customers to place orders, while others use message service Wickr.

Other criminals are using the site to offer counterfeit notes including British pounds, US dollars and Euros.

Requests for weapons and protection have also been advertised.

One seller, known as Michael, said he could produce cannabis within three minutes for a customer.

"I've been advertising on Craigslist for about three months, I just sell cannabis, I don't touch the hard stuff," 'Michael' told News Corp.

"I have a lot of cancer ¬patients, stuff like that. I also get a lot of backpackers who don't know the area, but they know Craigslist."

Cyber-safety campaigner and former Victoria Police officer Susan McLean said police needed to do more to stamp out the online drugs trade.

"Craigslist has been around for more than 10 years and it has always had a seedy underbelly," Ms McLean said.