Что значит Mein innerer Schweinehund.

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"innerer Schweinehund" is an idiomatic expression which is kind of an allegory for "weak willed" or a "hedonistic attitude". This expression is mostly used with either "überwinden/besiegen" in which case it means soemthing like "Not giving in to carnal/basic pleasures", or with the negative forms as the exact opposite.
This expression can refer to fairly normal things like (not) being able to hold a diet, as well as to complex issues, like letting oneself (not) be convinced by oversimpliefied, racist, sexist, ..... political views.

It definitely contains the idea of "right and wrong", "moral and immoral" and the degree to which people do (not) give in to it.