What does Ikke sant mean?

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It's a common interjection, roughly equal to English "right". It's usually appended to the end of a sentence to turn it into a question / way of showing you want someone to confirm what you've said. It's also common to reply to something someone's said simply with this phrase as a way to express agreement, and also allowing the person you're agreeing with to continue speaking.

In some dialects, such as some Western ones, the word "sant" by itself replaces "ikke sant". Some speakers and linguistic varieties employ "sant" and "ikke sant" much more than others.

It's of course also to encounter the words "sant" ("true") and "ikke sant" ("not true") in contexts where the meaning is intended to be understood literally.