Definition of gotta from the Oxford Advanced American Dictionary

 

gotta

 
NAmE//ˈɡɑt̮ə//
 
(informal)(non-standard)
 
jump to other results
the written form of the word some people use to mean “have got to” or “have got a,” which is not considered to be correct He's gotta go. You should not write this form unless you are copying somebody's speech.
See the Oxford Advanced Learner's Dictionary entry: gotta