Definitions by Elbow grease

Mister Twatbox 

Someone who is self important to a degree of uber arrogance.

Mister Twatbox is Someone who is regarded by most people as a complete dick, even amongst his friends.

i.e 'That Mr Twatbox Gordon Broon'
'Here comes Mr Twatbox, try and ignore him'

Mister Twatbox by Elbow grease May 9, 2010