In article >, teacherjh@aol.
nojunk.com says...

[SNIP]

Interesting. Thank you for the info.

I use the term for wine that is really not up to "snuff." Without going into
the derivation of "snuff," let's just say, wine that is not worth the effort
to consume. I have possibly/probably use the term incorrectly, but when I
mention that wine is "plonk," it means that it is not fit for consumption by a
person, who knows better.

Thanks,
Hunt