灌水本身係商業用語，指不良商人喺啲貨品，譬如肉類，灌入水分來謀取暴利。而今呢個詞作為網絡用語多咗個意思，指用戶用冇乜意義嘅字句，或者重複字句，或者濫發表情文字回覆帖子嘅行為。
Irrigation itself is a commercial term used to refer to unscrupulous traders who pour water into some goods, such as meat, to make huge profits. Nowadays, the word has an additional meaning as an online term, referring to the behavior of users using meaningless words, perhaps repeating words, or indiscriminately posting love texts to reply to posts.