Girlfriend or Female companion of a man (usually in his 20's) who is at least twice age. Not to be confused with a cradle schnitzel, as in this case, the man is enamored by older women. A bit less extreme than a gerontophile.

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