【熟】【俗】【喻】【贬】吃屎吃到了豆子，比喻。①碰巧得到好处。畀佢食屎食着豆，执倒条好筹。（让他碰上运气，拈到个好阄。）②没本事的人碰巧做成了事。咁水皮都攞倒高分，系食屎食着豆嗻！（这么差也拿到高分，是瞎猫捉到死老鼠罢了！）

(literally: to come across a bean whilst eating shit); an expression to describe when someone gets a windfall through sheer fluke / luck (with a disdainful connotation)