When someone dresses up in Teenage Mutant Ninja turtle (preferably, but regular turtle will do fine) apparel, and proceeds to get their dominatrix on with a woman. The wearer of the costume gets bonus points for a "cow-a bunga, dude."

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