Do Me A Lemon Edit Meaning

1.

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."

See cockney, favour, lemon, flavour

2.

Rare but recorded London phrase for 'Do me a favour'. Totally mystery origin, unless you know the answer.

"Oi Trev, you're not saying you need my motor again, do me a lemon..."

See stroll on, no way