1
To 'do a Birkett' is to revise science like it's your full-time job and your brain is on fire. You don't have a life, you just have a highlighter and a hatred for weekends.
I did a Birkett all night, and now my brain is screaming at me.
She does a Birkett every day, even on holidays. It's terrifying.
He did a Birkett so hard, his science teacher cried.