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Mad poon is when a chav gets so drunk and high they think they’ve turned into a sausage and start shouting about their genitalia in a pub.
My cousin said 'I’m mad poon' after he tried to dance on a table and fell into a keg.
She texted me 'I’m mad poon, I just ate a whole pizza and a bag of chips.'
He DM’d me 'I’m mad poon, I just turned my mum into a chicken.'