As yichusdik points out, using the term “shiksa” (or “sheigitz”) is the last thing that you want to do when you want to be mekarev someone – especially when talking about their wife/husband.
It is disgraceful that members of our community still use that terminology when talking about human beings created btzelem Elokim. I understand why the terminology developed – in previous generations our non-Jewish neighbours were often our persecutors and we could only fight back with words. Nowadays it’s no longer true. Our non-Jewish neighbours are usually fine people who deserve to be referred to respectfully.