The use of lemon in this phrase is abbreviated from the cockney rhyming slang 'lemon tart'
lemon tart = smart
"Don't get lemon with me son, or I'll take you outside and cut you open"
Dumb arse gooner hater ain't so lemon now!
cockney rhyming slang for smart
just cos you hit puberty that doesn't make you lemon tart
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