Young M.A. wrote in a Genius
attribution about the titular phrase:
"I've been saying 'OOOUUU' for a year—we've just been randomly saying it. Me and the bros will be like, 'OOOUUU,' and at first I wasn't going to name the song this. When I recorded the track and was saying 'OOOUUU' on it, I listened to it and was like, "I'mma just call it 'OOOUUU.'" And then people will be like, 'What the hell is O-O-O-U-U-U?!' People thought it stands for something."