Smashy smashy is vandalism, property destruction, at a demonstration, protest march or the like. A common example is breaking windows.
Smashy smashy is seen both with and without a hyphen, "smashy smashy" or "smashy-smashy"
There's an article about smashy smashy, property destruction at protests, called "Why All the Smashy-Smashy? A Beginner's Guide to Targeted Property Destruction".
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