gonna contracted weak form before a consonant BrE AmE (ˈ)ɡ ə n ə —There is no real Received Pronunciation strong form for this informal contraction of going to, although spelling pronunciations ˈɡɒn ə, ˈɡʌn ə are sometimes used in reading. There is an American English strong form ˈɡɔːn ə, ˈɡɑːn ə . —Before a vowel sound, the contracted weak form (ˈ)ɡ ə n u is sometimes used (see discussion at to .)
GONNA
Meaning of GONNA in English
Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012