Not if you are thirsty and speaking literally. If you are referring to a person's height, it can be insulting unless you know the person well enough to make it seem like a joke. Be careful!
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Anonymous Is a tall glass of water an insult?To call a very tall person "a tall glass of water" to his or her face may be anywhere from mildly to extremely embarrassing for the addressee, but I would not call it an insult. Used outside the range of hearing of such a person, it is not a really awful thing to say. Some people even use the expression as a sign