My own personal "pet peeve" cliche phrase is anything that is "literally" (except it's really figurative) something. So many people for so very long have used "literally" to mean the literal opposite of it's actual meaning. Even when they don't use it to mean it's actual opposite meaning, they'll still often use "literal" to describe a thing that is in no way actually literal. It just "grinds my gears" to hear it.