A guy who fucks a loaf of bread and then fucks his girlfriend who has celiac disease. Celiac disease is an intolerance to gluten and wheat related foods that can be deadly. The term is possibly referred to in the Frank Zappa song "Broken Hearts are for Assholes."

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