The name for someone who is particularly ugly, but you still regard as a friend. From the point of view of the ugly person that the term 'uggerz' is aimed at, it's not seen as being very offensive, more of a strange nick name.
ie A friendly name for a really ugly person

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed