leave a bad/nasty taste in the/your mouth
leave a bad taste in your mouthor
leave a bad taste in the mouth
If an experience leaves a bad taste in your mouth or the mouth, you feel that there was something unpleasant about it. Some of the magazine's jokes about women leave a bad taste in the mouth. Note: Adjectives such as nasty, bitter, and sour can be used instead of bad. I'm not staying where I'm not wanted. The whole thing leaves a sour taste in my mouth.