Affirmative response to "maybe". Analogous to responding to "No way" with "Way!"
Person 1: Can you come to my party?
Person 2: Maybe.
Person 1: Yesbe!
When you don't wanna take no for an answer.
Guy - Girl, you wanna gimme a call tonight? ;)
Girl - Errr..... Maybeee....
Guy - ERRR... YESBE....