WUD

Also paraphrased, "Whatcha doin'?" May be used by itself or at the beginning of a sentence.

Among friends, WUD stands for "What's up, dog?" This acronym is a casual way of asking your friends what (or how) they're doing ATM.

In American English, "dog" or "dawg" is a way to refer to a friend, while "What's up?" is commonly used to ask someone what they are doing or thinking about. Combining "What's up?" with "dog" produces a question that's equivalent to "What are you doing, friend?"