What do enemies mean when they shout 'plough the lily'?

What do enemies mean when they shout 'plough the lily'? - Cheerful young woman screaming into megaphone

In the prologue I hear a good many enemy soldiers shout this refrain as they charge at me. I presume when they say 'plough' they don't mean it in the agrarian sense, but I think I'm missing some cultural context here because I don't quite understand how Geralt is 'the lily'.

What exactly do my enemies mean when they scream 'plough the lily'?






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What do enemies mean when they shout 'plough the lily'? - Expressive angry businessman in formal suit looking at camera and screaming with madness while hitting desk with fist
What do enemies mean when they shout 'plough the lily'? - Man Wearing Brown Suit Jacket Mocking on White Telephone





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