How do natives pronounce "what the f**k?"

I'm pretty sure this is th-stopping, which is when people "pronounce the fricatives /θ, ð/ as alveolar stops [t, d]". It is especially associated with African American speech, but you will find it used elsewhere, in other dialects.

This can not only be heard in speech, it also shows up in written slang. Urban Dictionary, for example, defines the word "da" as:

  1. (slang) The

In all these expressions, the th is written as d:

  • Dafuq
  • Da bomb
  • New phone, who dis