Definition of betcha from the Oxford Advanced American Dictionary

 

betcha

 
NAmE//ˈbɛtʃə//
 
(informal)(non-standard)
 
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  • a way of saying or writing “bet you” in informal speech
  • Idioms
    you betcha(informal)
     
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    used to say “yes” when you are very enthusiastic about something “Are you going to the game this weekend?” “You betcha!”