Mad Keen
If someone is mad keen, they're so hyped they're like a dog waiting for a treat, but with more swearing.
He's mad keen on this movie, he yelled ‘this is the best movie ever’ before the first scene even started.
She's mad keen on this party, she texted me 10 times before it even began.
They're mad keen on this fight, they started shouting insults in the street before the match even happened.