毛主席穿裤衩只为挡中央
[máo zhŭ xí chuān kù chà zhĭ wéi dăng zhōng yāng]
Referring humorously to former Chairman Mao Zedong wearing briefs merely to shield the 'center', it's likely nonsensical slang combining history and absurdity probably intending ridicule. Please note this might appear offensive.