example: 'i'm gonna be late coming home tonight; i've got a whole 'nother ten rooms to clean.'

a phrase unique in its purpose. often mistaken for another, but, in truth, disimilar.

another is a neutral term, meaning one more of the same. a whole 'nother implies that there is something significant about this additional item.

a whole 'nother is sometimes miswritten or misheard as 'a whole other.' this is wrong, as well, because it implies a difference in the properties of the new item from those of its precursors.

this phrase is unquestionably unique to certain dialects. in other cultures, the same concept is stated 'one more entire' or 'another one on top of that.' thus, it lacks integrity when written, while when spoken it sounds perfectly natural.