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Seattle Seahawks defensive tackle Malik McDowell repeatedly called a female cop a "bitch" and a male cop a "n**ga" during his arrest in ATL on Sunday ... and TMZ Sports has the video.

We broke the story ... the 21-year-old rookie got into a verbal altercation outside of the SL Lounge early Sunday morning and cops were called to the scene.

When they arrived, McDowell went ballistic on the officers -- cussing them out and yelling at them ... even accusing them of planting evidence on him.

At one point he screams about how rich he is -- and that's why he feels justified calling the woman officer a "bitch."

The officer tells Malik to stop talking, to which he replies, "I can call you a bitch if I want to."

Malik tells the cops they'll never make as much money as he's made in the last 3 months and tells the woman, "You'll be a broke bitch for the rest of your life."