Cali Swag District Sues BMI

Cali Swag District says it hasn't seen a dime from a company that's supposed to pay 'em every time their smash hit gets played ... which is why they're now suing.

The guys behind "Teach Me How To Dougie" just filed suit against BMI ... claiming they were supposed to get half the royalty money when their hit dropped, but the music giant sent all the checks to the group's agent instead ... and the guys never got paid.

The guys have no idea how much they're owed, but they know it's north of $187,000.

In case you forgot ... here's the track.