“My mouth is a factory for every toxic part of speech I spew,” Sadie Dupuis sings at the beginning of Speedy Ortiz’s new single, “Tiger Tank,” and ain’t it the truth. The first track let loose from the Northhampton, Massachusetts, four-piece’s forthcoming debut LP, Major Arcana (out July 9 on Carpark), is all quaking, off-kilter rhythm and grumbling, sludge-slicked guitars, all of which Dupuis melts down and funnels into her lyrics. “Tiger Tank” starts out sounding like something off In Utero, but Dupuis’ over-it attitude and slacker poetry are pure Malkmus. She’s a shrewd collector of offbeat phrases, oddly textured words and surreal black comedy. “Don’t even care if they take my legs,” she concludes with a bleakly funny shrug. “I’ve limped before, I can limp again.”