Any situation that you normally would not over-react to, but since you're already under a lot of stress from other situations, you blow it out of proportion.
Why won't this DVD play?!?!?" "Dude, take it easy, it's just a movie." "I know, I'm sorry. I've just been under a lot of stress with work and my girlfriend, and this was just another nail in the coffin. No biggie, just a jar of pickles.
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A precarious predicament or generally any situation where the best option is hard to find/ not at all enjoyable.
The present war the United States is engaged in in Iraq is a jar of pickles.
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To Fart; usually in the Silent But Deadly mode.
Jesus Christ, Paul: Did you just open a jar of pickles?