GWAR frontman Oderus Urungus has slammed MEGADETH's Dave Mustaine for implying during a concert that Barack Obama was somehow responsible for recent mass shootings in Colorado and Wisconsin.While performing with MEGADETH on August 7 in Singapore, Mustaine told the crowd, "Back in my country, my president is trying to pass a gun ban. So he's staging all of these murders, like the Fast And Furious thing down at the border and Aurora, Colorado, all the people that were killed there. And now the beautiful people at the Sikh temple." He continued: "I don't know where I'm gonna live if America keeps going the way it's going because it looks like it's turning into Nazi America." Earlier today (Thursday, August 16), Oderus took to his Twitter account to say, "I don't need to berate Dave Mustaine to make him look like an asshole. He does fine just by opening his mouth. To say something as ignorant and insensitive as Obama 'staged' the recent U.S. mass shootings you would have to be… ME! I just can't think of anything more ignorant or insensitive right of the top of my head…" This is not the first time Oderus has had hash words for Mustaine. During a March 28, 2012 interview with Turbo from RSU Radio and the Metal Meltdown, the GWAR frontman noted that both he and Mustaine have been in the press a lot lately. "Yeah, but see, the difference between Dave Mustaine and Oderus is that Dave Mustaine, every time he opens his mouth, he makes a fucking idiot out of himself," Oderus said. "You know what?! Keep your mouth fucking shut, Dave Mustaine. Play your fucking guitar, all right?! Maybe keep it to the lyrics of 'Peace Sells'. Anything else… We don't wanna fucking hear about how Obama was born in Africa and how Rick Santorum is your man; he hates fucking heavy metal. Shut the fuck up, Dave Mustaine. Shut the fuck up, you God, cock-s***ing f****t." Mustaine in March made headlines when he told Canadian television and radio personality George Stroumboulopoulos that he is certain that President Obama "was born somewhere else than America." "I have a lot of questions about [Obama], but certainly not where he was born," Mustaine said. "I know he was born somewhere else than America." When Stroumboulopoulos pointed out that this school of thought made the musician part of the so-called "birther" movement, Mustaine countered, "I'm not calling a question to it, I just, you know, it's a point. How come he was invisible until he became whatever he was in Illinois?" Stroumboulopoulos tried to further challenge Mustaine on his claims, causing the MEGADETH frontman to attempt to change the subject. "I don't want to talk about my president," Mustaine said, before going on to admit that he was going to "have to do some more homework on where Obama came from."