/ ˈgɒtʃə; NAmE ˈgɑːtʃə/ exclamation
( non-standard ) the written form of the way some people pronounce 'I've got you', which is not considered to be correct :
'Gotcha!' I yelled as I grabbed him by the arm. (= used when you have caught sb, or have beaten them at sth) .
'Don't let go.' 'Yeah, gotcha.' (= Yes, I understand.)
HELP NOTE : You should not write this form unless you are copying somebody's speech.
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WORD ORIGIN
1930s: representing a pronunciation.