'boff', the shortened term of boffin is a common insult used by people of low intelligence to people of high intellegence. I believe it is a term used to cover up there own thickness, as what is wrong with being smart?
You boff!
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mug is an insult which is related to someones actions. E.g if someone kicks you in the balls they are a mug because of that action.
you mug!, Jhonny's a right mug!
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