Someone who is deemed as slow, inferior, useless or a bit stupid. Not being able to complete a relatively simple task. Being a BIT of a Wuddy is a derogative of Wuddy. Not EVEN a complete Wuddy, just a bit of a Wuddy.
See that Craig! He's a bit of a Wuddy!
I was watching this boy trying to unscrew a flathead screw with a Phillips screwdriver and he just seems to be a bit of a Wuddy!