Today I heard some English students asking some professors about how to call the following forms: "wanna, gotta, gonna, outta, watcha, dunno, and so forth". The professors didn't have the answer, neither did I, so I decided to make some research and share what I found.
I won't paste a long definition you can easily find on the web, I'll just write what in short Sandhi forms are. They are contractions or reductions that are not appropriate in written English, but that are valid in informal spoken English.
