When something unbelievable occurs/ happens.
You are writing a paper on Microsoft Word and you computer suddenly shuts down and you lose everything that you typed. You can't believe what just happened and so you say "what kind of deal?!"
Instead of hitting up your friends saying what’s the deal just shorten it WTD or WSTD
Typically used when a male is asking a girl if she’s is dtf or trying to get at or with a girl
So Tracy what’s the deal?