In text messaging and online, "dw" is an acronym that stands for "dont worry". It is often used to reassure someone that the situation is all good and to not stress. For example, "I just arrived dw; see you in a bit". It can also be used to show that you have taken care of a problem or situation, giving someone assurance that you have a handle on things. In addition, "dw" can also stand for "darling wife" or "dear wife" in text messages and social media.