Alec Baldwin I Didn't Say F*g ... I Said Fathead

11/14/2013 2:17 PM PST

Alec Baldwin -- I Didn't Say F*g, I Said Fathead

Alec Baldwin is on the Twitter attack, claiming he did NOT call a reporter a "c**ksucking f*g" earlier today ... he called him a "c**ksucking fathead."

Further, Alec is threatening to sue TMZ for even suggesting that he used the homophobic slur.

Baldwin wrote, "Acoustic analysis proves the word is fathead. Fathead ... Anti-gay slurs are wrong. They not only offend, but threaten hard fought tolerance of LGBT rights."

Watch the video and decide for yourself.