"You sometimes drop a line that really hits me."
"You come out with a line that really gets me sometimes."
"You occasionally say something that really strikes a chord."
「あなたは時々グっとくる一言をキメてくる」は、英語では
・時々(sometimes / occasionally)
・グっとくる(hit me / get me / strike a chord)
・一言をキメる(drop a line / come out with a line / say something)
という3つの要素に分けて表現します。