It turned out to be a big mass of food gunk that coagulated around 50 feet downstream of the sink.
Not cheap to have the plumber come and clean it all out, but at least it wasn’t something worse, and I guess better than taking a day off work and hoping to fix it myself without knowing what exactly it was.
I did redo the plumbing under my wet bar sink. Not sure what happened but I took the p-trap off to check it out and it was kind of rusty and long cracks forming along the side. The ABS fixtures seems to hold up better than the chrome-plated stuff.
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