When talking about going somewhere, receiving something, or contacting someone. Can be talking about food, places, or even sex. Is also used when asking for something. In extreme cases the phrase "that shit" is inserted in the initial phrase.
Yo, let me hit up on that answer.
Prices shown in USD.
邮件由 email@example.com 发出。我们决不会发送垃圾邮件。