Rumor has it this song is about Keith Morris
, who fronted Black Flag between 1976 and 1979. Morris admitted that his drinking caused a tension between him and the rest of the band: "Whenever there would be arguments, everyone would be pointing their finger at me, and it would be my fault. Like, if we weren't learning new songs fast enough, it was my fault. Coming to rehearsal after having drunk a six-pack of beer, maybe having snorted a couple lines of coke, that would be my fault. They made me feel like I was the cement shoes attached to their feet." Morris was replaced by Ron Reynes, who was then replaced by Dez Cadena, who was then replaced by Henry Rollins in 1981. Rollins remained front man until Black Flag's dissolution in 1986.
Despite the mocking tone of "Six Pack", Morris revealed to The Quietus that he has no beef with Rollins, in fact, he is a big fan: "I've got the utmost respect for the man; I don't have a bad word to say about him. I'm one of the administrators of the Black Flag Facebook page. So if they start talking sh*t about Henry I'll put them in their place, I have no problem doing that. Because Henry went out and did the work. Henry busted his ass. Henry was in the van, Henry slept in cardboard boxes, in a metal shed behind the Ginns' house, Henry slept under a desk at the SST offices at Redondo Beach, Henry would've got $5 a day while they were out on the road, Henry scrounched around for whatever food he could get or whoever's floor he could sleep on that night when they were out on tour. So anybody that has any bad words about Henry, 'Oh, he's an asshole, he's a fag because he lifts weights and he hangs around a bunch of guys', that's all a bunch of bullsh*t. I'm here to shoot that down. And I won't shoot it down with a bullet; I'll shoot it down with a nuclear weapon. Hank's a straight up, no-bullsh*t guy. As for a vocalist, he is my favourite Black Flag vocalist… after Dez, who I like more than Ron. Now Ron's a better vocalist than I am. I'm a better vocalist than Dez but I'm not as good as Henry, Henry's better than Ron and Ron is better than me and Dez is better than me. Do you get a sense of where I'm going with this?"