One way to hold this word: it is a blunt, rude label slapped on the state a person is in right now — not what they are like, but what has happened to them. The word itself does not say which state; the country the speaker is in decides that. On one side of the ocean the label lands on too much drink, on the other on too much anger.
可以想成：pissed 是一張很粗的標籤，貼在「這個人現在整個不對勁」上面。它講的不是這個人平常怎樣，而是現在被什麼弄成這樣。至於是哪一種不對勁，字本身沒說，是說話的人在大西洋哪一邊決定的。一邊貼給喝太多，一邊貼給氣太大。
From the word’s history
Wiktionary gives pissed as piss plus -ed, going back to Middle English pissed. The rude verb underneath is why both meanings still feel coarse, whichever state the label names.
Wiktionary 記錄 pissed 是 piss 加 -ed 來的，可以上溯到中古英文 pissed。底下那個動詞本身就是粗話，這解釋了為什麼不管哪一個意思，這個字都不能用在正式場合。
Wiktionary, "pissed"
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