An advertising agency is calling bah bah bah bah BS on Pepsi (get it, like the jingle?) -- claiming the soda company jacked its idea for their fancy 2016 Super Bowl commercial with Janelle Monae ... and now they're suing.
You know the ad ... it starts with Janelle dancing to the '60s hit "Do You Love Me" in front of a jukebox -- before moving to another room with '80s music ... and another room with a more current vibe.
Turns out, an ad agency called "Betty, Inc." claims they came up with a virtually identical idea and pitched it to Pepsi back in November ... but the two sides couldn't agree on a deal.
Betty says Pepsi emailed them in December to tell them they were going in a different direction.
Fast forward to February ... when the ad aired -- an ad that Betty says was based on their concept.
Betty's pissed -- and wants Pepsi to pay up for stealing their idea ... especially since Pepsi hailed the spot as a smashing success.
A rep for Pepsi said, "This lawsuit is without merit and we plan to vigorously defend ourselves."