It means: "Why don't we eat in the soda."
If you mean the Spanish ''por'' as in the English ''for'', its για (gia).
por auto = by car
es por ti = is for you
if
For your
por kay (spelt 'por que') is simply "why"; e.g. 'por que no?', "why not?"
por la vida= for life
If you please
of course
Finally
why not
"Por último" in English means "finally" or "lastly". It is used to introduce the last point or item in a list or sequence.