Early documented uses seem to use the word as synonymous with smear. This suggests someone who is smarmy is also slick or slippery. sod's law is a British axiom that basically means if anything can go wrong, then it definitely will go wrong. For example, dropping your toast, it always falls butter side down. But there are plenty of blokes who fancy themselves as being classy like James Bond but they just come across as being smarmy,. don't you think?
Finally, here is the third part of this series about English slang words and expressions that most British people know, but which will probably confuse almost everyone else! I started this series in 2019. It's only taken me nearly 4 years to get round to finishing it. Learn loads of slang and culture, plus a bit of British history too.
Vocabulary and transcript available on the episode page here https://wp.me/p4IuUx-aj8
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