You almost never say this word alone. You put it after scare or frighten: to scare someone shitless is to make them extremely frightened — so frightened they can hardly think. I was scared shitless is the usual shape.

You almost never say this word alone你幾乎不會單獨講這個字。 You put it after scare or frighten你會把它接在scare（嚇）或frighten（使害怕）後面: to scare someone shitlessscare someone shitless is to make them extremely frightened意思是把某人嚇得要死 — so frightened they can hardly think嚇到幾乎不能思考。 I was scared shitless is the usual shape最常見的講法是I was scared shitless（我嚇得要死）。

It is rude, because of shit. You will hear it in informal talk and in films when someone wants to say they were not just scared, but terrified.

It is rude它很粗俗, because of shit因為裡面有shit這個字。 You will hear it你會在 in informal talk and in films口語和電影裡聽到這個字, when someone wants to say they were not just scared, but terrified當有人想表達自己不只是害怕，而是嚇壞了的時候。

Though actually the -less here does not mean “without shit” in a straight way. It is a dark joke that follows phrases like scare the shit out of someone: the fear is so strong it is as if something is shocked out of you.

Though actually不過其實, the -less here does not mean "without shit" in a straight way這裡的-less並不是直接表示「沒有shit」。 It is a dark joke這是一個帶點黑色幽默的說法 that follows phrases like scare the shit out of someone接在像scare the shit out of someone這樣的說法後面: the fear is so strong it is as if something is shocked out of you意思是嚇得太厲害，好像有什麼東西被嚇出來一樣。

Do not use it with a teacher or in a shop. Terrified or really scared will do.

Do not use it with a teacher or in a shop不要對老師講，也不要在店裡講這個字。 Terrified or really scared will do用terrified（嚇壞了）或really scared（真的很害怕）就夠了。