What is Yea Prolly?
1.
An excellent response that can mean "yes" to the most extreme extent or "No" to the most extreme extent.
My brother: Can we go to radio shack to buy a new mouse?
Me: Yea Prolly
(as you see I am actually sitting here on urban dictionary with no intention to get his mouse, yet i have effectively answered his question and he has shut the fuck up.)
See