The term that evolved from SEO GURU... if you look up the actual people who dare calling themselves "growth hacker" publicly, you will find most of them are gimmicky snake oil salespeople who offer nothing crazy, fancy, or even new. There are some really famous and hyped lying salespeople like these around...

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

A new, more aggressive and results driven approach to marketing. A growth hacker may employ a list of media and campaign models executing a list of simple tag lines or interactive marketing techniques. The hacker will pay attention to the results, tweaking the campaign to the exact audience or method until optimum results are reached. A growth hacker literally uses all possible combinations and learns from each trial. Similar to a scientist working on a new discovery.