Fellows perform backflip on board (4)

I believe the answer is:

sods

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'fellows' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sods that I've seen before include "Lumps of earth" , "Turves" , "Unpleasant people" , "Lumps of turf" , "sort of law" .)

I've seen this clue in the Sydney Morning Herald.

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