I'd do him
A loud and proud way to say you'd stick your finger up his butt if he asked you to.
My girlfriend asked, 'Would you do him?' I said, 'I'd do him. I'd do him in a heartbeat.'
He asked me if I'd do him. I said, 'I'd do him. I'd do him and then I'd do him again.'
She said, 'Would you do him?' I said, 'I'd do him. I'd do him and then I'd do him some more.'