Opinions make the world an interesting place, but some people might go to extreme lengths to make sure other believe what they believe. Some people get angry when a person has different opinion.

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

One of many ways to start a YouTube comment war.

a person's thought/idea that may seem truthful in their eyes but may not be in someone else's; a personal view

Something that people should keep to themselves when writing a definition for UrbanDictionary.

Sometimes used as an excuse for someone to say anything they want.

Contrary to what many people who add 'definitions' here think, Opinion is not the same as Definition. Opinion is the usually biased twisting of facts based on someone's viewpoint. Definition is impartial fact.