DJ Cummerbund dropped “Fat Thumping Girls” on April Fool’s Day, and it’s exactly as committed and ridiculous as that implies. The mashup locks Chumbawamba’s 1997 anthem “Tubthumping” together with Queen’s 1978 classic “Fat Bottomed Girls,” then keeps going, folding in Sade, Madonna and John Mayer, a well-timed appearance from the Shake Weight, and the obligatory Randy “Macho Man” Savage cameo that Cummerbund fans have come to expect. It shouldn’t work as well as it does, but that’s precisely the point, and the editing here is sharp enough to make the whole chaotic thing feel inevitable.