Iggy Azalea -- Fires Back At Eminem ... I'm 'Bored' Of Your Rape Threats

Iggy Azalea is beefing with ANOTHER huge rapper -- blasting Eminem for saying he's going to rape her in a new rap song.

Em went after Azalea in a track called "Vegas" from his upcoming album ... saying:

"So, what’s it gon’ be?
Put that sh-t away, Iggy
You gon’ blow that rape whistle on me ... scream!"

Clearly, Iggy wasn't too happy about the lyrics and fired back on Twitter:

"Im bored of the old men threatening young women as entertainment trend and much more interested in the young women getting $ trend. zzzz"

She continued, "Its especially akward because my 14 year old brother is the biggest eminem fan and now the artist he admired says he wants to rape me. nice!"

"Women in music have the bigger balls anyhow we endure much more harassment and critic."

It's interesting ... considering Iggy just wrapped up another huge rap war with Snoop ... who called her a "b*tch" and a "c**t."