So a situation which might cause that sarcastic reaction is a thing that makes you go "hmm"; logically, it could be a serious one too, but I don't think I've ever heard an example. The phrase was popularized in that sarcastic sense by Arsenio Hall, who often uses it on his TV show as a theme for an ongoing series of short jokes. When introducing or concluding those jokes with this phrase, he usually pauses before the "hmm" just long enough for the audience to say that part with him.
想摘下星星给你，想摘下月亮给你，你想要的都给你，送她这款星月项链，星星月亮一起送给她！
This sounds a little unnatural. Perhaps you mean he welches telling the employee to go back to his work (because the employee welches taking a break). I'2r expect: Please get back to your work hinein such a situation.
知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。
多种颜色一定会满足她的少女心的！顺滑好涂，无味环保，每天看到手上的颜色，就能想起你的臭宝，送给她，准没错。
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披星踏月，为爱而生，吊坠采用星月造型设计，线条流畅圆润，精美小钻点缀，彰显典雅自信气质，让她美的不在单调，遇见幸运，遇见你，那些和你在一起的日子，连空气都是甜的！
知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。
Mysteryland. A series of electronic music festivals held by the Dutch promoter ID&T. Being the first of its kind rein the country dates back to 1993.
戚薇同款星兔保温杯，女生用杯子，主要是看颜值，送这个准没错，这颜值！！
这款蜂蜜的好处是分条装的，独立包装，每天给包里装上几袋，随时随地，即开即食，简直是方便的不得了。
Now, what is "digging" supposed to mean here? As a transitive verb, "to dig" seems to have basically the following three colloquial meanings:
这个香水拿到手里，瓶子里面布灵布灵的，味道甜而不腻，不浓不淡，优雅不失活力，送她绝对喜欢。而且价格上也合适，有优惠券可以领！
知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。