I just asked my friends what I should add to the urban dictionary and they said "I don't know" so here is the definition :)

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

What do you think it means? Whats that? You don't know? OH MY GOD! YOU JUST WORKED IT OT!

the three most helpful words in any relationship

I don't know; or in other words: I do not give a fuck about what you're asking me.

Mostly used when you don't want to start a conversation with someone.

A phrase that people use sometimes when they're too lazy to explain anything.

the foundation of a relationship