Shortened version (and dare I say
corruption) of 'you betcha', used to make
fun of the Sarah Palins of the
world.
Christy: I'm gonna (hic) go try and hit on that
cop.
Bob: Ubetcha!
Christy: What was that? (hic)
Bob: Nothing.
(30 seconds pass)
Rob: Did she just puke on that
cop's lap?
Bob: Ubetcha!
In both instances above, Christy is the one being made
fun of.
