betcha
bet·cha ˈbe-chə 
informal
—used to represent the sound of the phrase bet you when it is spoken quickly
And I betcha you've got at least three or four hundred dollars' worth of clothes on your back, and you still look downright haggardly.
Terry McMillan, Waiting to Exhale, 1992People stand up to look at the time so's they know whether they're early or late for work. I betcha a million people look at that clock every day … Betty Smith, A Tree Grows in Brooklyn, 1943
—used especially in the phrase you betcha as an enthusiastic way of saying "yes" Terry McMillan, Waiting to Exhale, 1992People stand up to look at the time so's they know whether they're early or late for work. I betcha a million people look at that clock every day … Betty Smith, A Tree Grows in Brooklyn, 1943 Some say I repress my anger, and I reply, You betcha. Michael Perry, Backpacker, June 2003"You guys okay?" I ask, much like a babysitter. "You betcha," Lyle says. — John Grisham, "Quiet Haven" in Ford County: Stories, 2009
Michael Perry, Backpacker, June 2003"You guys okay?" I ask, much like a babysitter. "You betcha," Lyle says. — John Grisham, "Quiet Haven" in Ford County: Stories, 2009