

I’m pretty sure vinegar strokes is old English slang, and that would seem to align with this British online definition of it predating the appearance on The League by 2 years.
https://www.arrse.co.uk/wiki/Vinegar_Stroke
P. S. I will now have a totally different understanding of the song “Turning Japanese” everytime I hear it
Completely fair. When your neighbour is as untrustworthy and aggressively expansionist as the Russian government I would line the border with mines too.