what are you going to do
whatcha gonna do
/ˈwʌtʃə ˈɡʌnə du/AssimilationReduction
In real speech
What happens to the sounds
Two squeezes in a row: what are you → “WHAT-cha”, going to → “GUN-na”.
When to use it
What are you gonna do? = what will you do? Also a shrug: “Whatcha gonna do?” = what can you do?
Casual → formal
Slang
whatcha gonna do
Neutral
what are you going to do
Formal
what do you intend to do
Sound notes
Assimilation: neighbouring sounds change each other, e.g. t + y → “ch”, d + y → “j”.