Yiddish equivalent to the english
bimbo; a somewhat scattered, generally busty, female. Pronounced SHIK-suh.
The Alternative Yiddish Dictionary provides the below usage suggestions:
This is the kind of word grandmothers use to describe the blonde boy-toys that their teenage grandsons want to date. Generally insulting to a woman's mental abilities. As in, "You're dating ***HER***?? That shikse?? You want I should plotz?"