Birdman Sued -- Producer Claims He Got Stiffed Via Hilarious Text Messages

Birdman is accused of using the social media version of "The check's in the mail" to blow off Lil Wayne's producer who is now suing him for a fortune.

The producer -- who goes by DVLP -- had his people make various demands that Birdman and Cash Money cough up $200,000 for work he did on albums for Wayne and other artists.

Birdman's response shows the new frontier in blowing off creditors. Forget a lawyer's letter ... Birdman is all about texting DVLP to hold him at bay.

Some of the texts ...

-- "I'm getting yu paid"

-- "I'm working with yu fam"

-- "You gone get tht 200k"

-- "s**t GETTIN don"

Apparently it didn't, because DVLP is taking it to a judge.