A child that results from a sperm donation and is treated as extended family on the part of the sperm donor. In particular, a spuncling is to a spuncle, what a niece or nephew is to an uncle (or aunt). The term is gender neutral.

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