A DWIT is a hapless person who's caught between being a dweeb and a twit. A total loser with no hope of ever changing. A DWIT is more of a put down than either of its words of origin.
The used car salesman sold that DWIT a Yugo.
Only a DWIT would try to smack down a pit bull.
He's a total DWIT. He asked his cousin to go to prom with him