[auxiliary verb] [+ infinitive without to] [esp. US] [informal] - be going to"What you gonna do about it?" "Beats me!"I think I'm gonna throw up.He wants me to lend him some money, but I'm not gonna.USAGE: In written English 'going to' is usually used instead of 'gonna'.
GONNA
Meaning of GONNA in English
Cambridge English vocab. Кембриджский английский словарь. 2012