I saw the liner notes to my roomate's copy of a Twisted Sister album. There was a paragraph stating about the listener's audio enjoyment as he/she listens to the recorded music on a stereo. It goes la-da-da-da-da, on and on until the last sentence says "in other words, PLAY IT LOUD, MUTHA!" Also, I once saw someone wearing a T-shirt with a picture of the band's singer Dee Snyder shouting that phrase.
by I Saw U2 Live Twice July 11, 2008