Bad-taste-in-one-s-mouth definitions

(idiomatic) A feeling something is morally despicable as to cause nausea.

The more I thought of my orders, the more it left a bad taste in my mouth.

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(idiomatic) A feeling of guilt, responsibility, or embarrassment as to cause nausea.

Knowing that I had inadvertently aided a killer, left me with a bad taste in my mouth.

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(idiomatic) A feeling of disappointment and frustration.
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Origin of bad-taste-in-one-s-mouth

Refers to the feeling of nausea or its aftereffects.