Atlanta Falcons star Takk McKinley's Twitter fingers just cost him a chunk of change ... with the team reportedly fining the defensive end over his recent Twitter outburst.

McKinley -- a 2017 first-rounder -- seemingly called the Falcons front office clowns after the trade deadline this week ... claiming the team should have pulled the trigger when he wanted out of town last season.

"These @AtlantaFalcons turned down a 2nd round draft pick when I requested to get traded last year," Takk tweeted Wednesday.

"The same @AtlantaFalcons turned down a 5th and 6th round draft pick from multiple teams when I requested to get traded this year. I only have 17.5 career sacks."

"🤡🤡🤡"

While the team denied any actual offer was presented, interim head coach Raheem Morris made it clear he was NOT happy about McKinley's decision to air out his frustrations on Twitter.

"Takk will definitely be held accountable for his actions and everything that goes with it," the coach said.

Now, we know what that means ... with the Atlanta Journal-Constitution reporting Takk was fined an undisclosed amount for the tweets.

Whether the two sides will be able to make up is doubtful -- the team has already declined his 5th-year option and hasn't ruled out cutting McKinley's playing time or suspending him.

As for Takk's tweet ... it's still live on his account.

No regrets??