… and stuff (dismissive): sách siếc, học hiếc

Copy a word and swap everything after its first sound for -iếc, and you get a dismissive "X and all that": học becomes học hiếc, sách becomes sách siếc, phim becomes phim phiếc. The first sound stays; the rest changes.

It shows that the speaker doesn't think much of the thing, at least right now: Mệt quá, học hiếc gì nữa, I'm too tired, forget studying. It usually comes with gì, often in a complaint or a question that isn't really asking: Phim phiếc gì mà dài quá trời vậy, what kind of film is this, it goes on forever.

It can sound teasing or impatient, but often it's just casual, a way of waving something aside: Đẹp điếc gì, mặc đại đi! Never mind looking nice, just throw something on!

Use it only with people you're close to, and never about something that matters to the other person. About someone's work or plans, it sounds as if you're brushing them off. Outside chat messages, it doesn't belong in writing.

As a learner, recognising it is what counts: when you hear a word followed by its -iếc copy, the speaker is playing it down.