The Interweb defines "Polar Opposites" as "that which is conspicuously different in most important respects." If you would like a more visual definition of the term, take the following as an example:

Sample A: Anna Kournikova in a bikini

Here is a photo model/former tennis player Anna Kournikova. In this recently taken photo, you can see that Anna still has what it takes to be considered a Stokkeshow by the Stoolies. Smoking frame, pouting lips, killer face, duchebag boyfriend...She is (or was), however, a lousy professional tennis player.

Sample B: Serena Williams

Here is a recent photo of current tennis star/model (?) Serena Williams in what looks like a bikini. Serena appears to have risen from the ocean's floor after years of hibernation, a la Godzilla. This photo sends Stoolies running for cover. She is, however, considered the best tennis player in the world and may go down as one of the greats of all time. In comparison she would be a "Polar Opposite" of Kournikova.

Look at this poor bastard. He looks scared to death. He looks like if he doesn't bring her the snack in a timely manor, she' might just eat him instead. Look at those legs. The thunder god Thor would have a tough time lifting one of those meat-racks up.