Definition of "betcha"

betcha

/ˈbɛt͡ʃə/

contraction
1. (informal) Pronunciation spelling of bet you.
  Quotations
  ‘[A]nd I’ll betcha Ignatz here’d think the top of a cocoanut tree nineteen times wonderfuller.’
  1932, Delos W. Lovelace, King Kong, published 1965, page 19
2. (pronunciation spelling, informal) Can be sure of it.