Don't waste your time on those trashy magazines, they're full of pigswill.

pigswill 是由 pig（猪）和 swill（泔水、残羹剩饭）组成的复合词，字面意思是"猪食"。在这里用作比喻，形容那些杂志内容低劣、毫无价值，就像给猪吃的泔水一样。