Question

Could you tell me what Is a Shiksa?

Answer 1

Yes, I could. You came to the right place.  And even though you didn't actually
ask for the meaning of the word, I'll go on and tell you anyway:

"Shiksa" is a Yiddish word, that came via a long and tortuous route
from a Biblical Hebrew word that means something very different from
the way it's used.

The way it's used, it means a young lady who's not Jewish, typically
in connection with a Jewish guy who is either considering dating or
even considering marrying a young lady who is not Jewish.

If the word is in any way pejorative, its implications are never directed  
against the young lady, but rather against the guy, since marrying within
the faith is a very strong tradition and value within any Jewish community.