Ke$ha has wrote a song about "fake orgasms" to get back at an ex-boyfriend.

The 26 year-old singer has recorded a new track called U Suck A**, which was inspired by a recent romance gone badly with a guy she claims has a "tiny penis".

She said: "Right now (my new songs are) more dude-oriented, because I recently had this boy just be a total piece of s**t, douchebag piece of garbage (to me). And he has a tiny penis, and he sucks real bad, so I'm writing about that."

"I wrote a song called F**k You, but then that title was already taken, so U Suck A** is another title. It's talking about fake orgasms every time I had sex with him, and how I pawned all the diamonds he bought me in Vegas and bought some Chanel earrings."

While other celebrities including Taylor Swift are no strangers to writing about their failed relationships, Ke$ha, warns that it's not a good idea to get on her bad side.

She told MTV News: "Don't f**k with me. Out of all the bitches to f**k with ... I'll write a whole album and tell somebody in an interview all about you, all the fake orgasms, tiny wieners."