gonna.

listen to the pronunciation of gonna.
Английский Язык - Турецкий язык
-ecek
Английский Язык - Английский Язык
Going to (before a bare infinitive)

I'm never gonna give you up.

A marker of the future tense
will, intend to (slang usage)
Gonna is used in written English to represent the words `going to' when they are pronounced informally. Then what am I gonna do?. a way of saying 'going to'