One way to hold the word: something that has taken in as much as it can hold. Press it and water runs out; step on it and it gives way; it has gone soft and lost its shape. Everything soppy does grows out of that soaked thing — sometimes what it is soaked in is water, and sometimes it is feeling.
From the word’s history
From sop, a piece of bread dipped in liquid, plus -y. The word has meant soaked from the start. Wiktionary notes that despite the similar sound and meaning, the emotional sense is not etymologically related to sappy.
來自 sop（泡在湯汁或牛奶裡的麵包）加上 -y，所以這個字一開始講的就是「吸飽了水」。來源另外提醒一點：雖然 sappy 聽起來很像、意思也接近，但那個「多愁善感」的意思和 sappy 在字源上沒有關係。
Wiktionary (kaikki extract) soppy: 'From sop + y. In sense 2, unrelated etymologically to sappy (excessively emotional).' source_ref kaikki:3f6f69a190036ae4:1399814559
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