English term or phrase: Email Required, but never shown. Automatic update in The vinegar here means "acrimonious". Participation is free and the site has a strict confidentiality policy. Post as a guest Name. I've never heard the pith version.
If you really need to keep "vinegar" in, then "she's as sour as vinegar" would probably do. Though using it would mark you as a bit old-fashioned because on the whole, the idiom's usage has all but faded. The subsequent popularity of Steinbeck, particularly in the 60s and 70s probably cemented the phrase into the language. It meant being still young and maybe spirited aggressive energy" as in the above post. Unless someone misheard someone with a lisp say, "Piss and vinegar. Norman Edward 7.