"I'm outta here. I'm not doing this sh*t no more."
That's seriously how Dallas Cowboys defensive lineman David Irving announced his NFL retirement Thursday night ... going on Instagram Live to tee off on the NFL's drug policy and quit his job.
The 25-year-old was suspended indefinitely last week after reportedly violating the league's drug policy again ... and now he's letting everyone know he's taking the punishment by smoking weed.
"Basically guys, I quit," Irving said. "They wanna talk about a suspension and all this other nonsense. I'm outta there.