Radiogrounds was a free, online radio made for the users of Newgrounds.com. It had the slogan "Where rampant sex is encouraged and swearing is mandatory!", though standard chatroom rules actually applied.
The songs played on Radiogrounds may be downloaded at the Audio Portal on Newgrounds.
The Radiogrounds website is no longer online, and had not been updated since late 2011. Many formerly existing features, such as the ability to request songs and the built-in chat had been unavailable for some time previously. The radio stream itself is still available online here and can be tuned to with a compatible client.