One way to hold this word: a peak. Pleasure builds, reaches its highest point, and lets go all at once. The literal uses name that peak in the body; the everyday use borrows the shape of it and hangs it on anything that feels like a high point - a bowl of shaved ice, a view, the last song of the night.
「orgasmic」的核心畫面可以想成一個頂點：感覺一路往上堆，衝到最高處，然後一次放開。字面的用法就是在講身體上的那個頂點。日常那個誇張的用法則是把這個「到頂」的形狀借走，套在任何讓人覺得爽到極點的東西上——一碗剉冰、一片風景、當晚的最後一首歌。
From the word’s history
Wiktionary traces the adjective to Ancient Greek and notes that the historically regular form is orgastic, on the pattern of enthusiasm / enthusiastic and sarcasm / sarcastic; the -mic shape also appears in cataclysmic.
依據來源，這個形容詞來自古希臘文，而且歷史上比較規則的形式其實是 orgastic，就像 enthusiasm 對 enthusiastic、sarcasm 對 sarcastic。不過 -mic 這種形狀也出現在 cataclysmic 上，所以 orgasmic 後來就通行了。
Wiktionary, "orgasmic"
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