Did you eat yet & do you want to eat together?

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

To ask someone if they ate yet.

Some consider this "Pittsburghese". Many people in Pittsburgh speak so quickly and with so little enunciation, that you often get phrases like "J'eat yet" or something about the Steelers and drinking into a three word sentance.
This particular phrase, however, is merely, "Did you eat yet?" Although, it can also sound like "Jeat jet?".

Though some people may think that they are superior to others, and therefore believe only people in Pittsburgh say this, j'eat yet is a sped-up pronunciation of the phrase "did you eat yet?", said throughout the country. It is especially notable in rural South Dakota, Appalachia, and (apparently) Pittsburgh.

One of those stupid sayings Jeff Foxworthy says