I gotta piss like a wounded Jap
When you have to pee so bad it’s like a Japanese soldier got shot, dropped his rifle, and is still trying to pee through the pain.
'I gotta piss like a wounded Jap,' he said, and I believed him.
She ran out of the room like a wounded Jap with a full bladder.
He was so desperate, he said he had to piss like a wounded Jap and was going to die if he didn’t.