Lemon tree
LEM-on tree · rhyming slang
Knee.
Person 1"Why are you limping?"
Person 2"Did me lemon tree playing touch footy."
"He was down on his lemon trees looking for the remote."
Where it's from
Rhyming slang: lemon tree rhymes with knee.

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While you're here
What's the story? What's happening, or what's the news?
The missus. Your wife or partner.
Head.
A look. Usually shortened to "a butcher's". In older Australian slang, being "butcher's" also meant being crook (sick).
Go for a piss.
Off for a turd.