Guitarist Jerry Cantrell told AllMusic that a lot of the songs on The Devil Put Dinosaurs Here started with collected riffs jammed by him and, drummer Sean Kinney. "It would be me and him in a dressing room or during a sound check," he said. "It can be voice messages recorded on a phone. (Alice associate) Baldy will be following us around with a camera, and we'll be like, 'Hey Baldy, record this!' You'll get home and have thirty or forty fu--ing two-minute blips, a riff, or whatever. Then, you wade through that.
"Every song always starts with a joke title," he continued. That one was called 'Manmouth' because we were sound-checking at Monmouth. We started to call it 'Manmouth' of course [Laughs]. That song is cool because it goes in a lot of different places. It's basically got four or five things that could be songs on their own put together to make one. It's got that creepy Black Sabbath thing in the Geezer Butler-type intro."