A slag is like the first piece of bread in a loaf. Everyone touches it, but nobody wants it.
The Unwanted Bread Slice Analogy for a Slag 's Life's Piece of Bread
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Explain Bear
Alright, listen up, buttercup. You think you're some kinda bread expert, huh? Newsflash: you ain't. This joke's layin' it on thick. It's comparing a "slag" (which, let's be real, ain't a compliment) to that first slice of bread in the loaf that everyone manhandles but nobody actually wants to eat. Get it now, genius?