do me a lemon

Means literally 'do me a favour'. The lemon part is Cockney rhyming slang, and is short for 'lemon flavour', so in other words it's really "do me a lemon flavour"

The usage is mostly to reject an offer or behaviour of some kind, due to its being undesirable in some way (as opposed to actually asking for a specific favour).

"Do you want to buy my iPod for 100 quid?"
"Do me a lemon. I could get one on ebay for 50."

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