Overuse of "definitely." I blame Office Space. Or Rain Man.
This is one that may be widespread, or may be confined to only a small corner of southeastern Wisconsin: trailing off EVERY sentence with "or..."
Examples:
"Sooooo, are we gonna go to the MOVIES, or are we gonna eat DINNER, or...." (random gesticulating)
"Now, are we supposed to get STARTED, or do we WAIT here, or...." (random gesticulating)
Yeah I don't like either