Usually someone who acts exactly like the Seinfeld character of Newman. Sometimes it can be even used as a nickname for said person. Most of the time, if your name is Terry, you could be nicknamed Newman by your friends.
A newman is another name for someone who is only partially spasticated/mentally challenged. It may not be a form of disablilty, but certainly does show signs of difference from a normal person
Another obvious sign of being newman'd is having a tongue too big for your mouth, also, negative reactions from the femalegender are a certainty. Most newmans are found in the london area, possibly due to pollution or living in a well
My, god, look at that newman
When a newman does something that shows them up, they should be reffered to as 'twat newman'
look at that boy, i feel so sorry, he's recently been found out to be a newman