Puts lead in your pencil

phrase

Gives you energy or vigour, especially sexual. Said of food, drink or exercise.

Person 1"Another oyster?"

Person 2"Go on. That'll put the lead in your pencil."

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While you're here

Dry as a dead dingo's donga
Extremely thirsty. Also used for weather that has not seen rain in months.
Flog it like you're 15 again
Going at something with great enthusiasm. A masturbation joke.
Show us where the roo scratched you
Asking a woman to show you her genitals. Probably not the smoothest way to do it.
You're rooting this cat, I'm just holding the tail
It's your problem or project; I'm only helping. Don't blame me.
Off like mum's pants on Father's Day
Leaving right now, in a hurry.
He'd root a snake's mouth if someone held it open
He will have sex with anyone or anything.