stop the bus and eat a wee-wee

My favourite school bus song was 'stop the bus and eat a wee wee'. I loved it so much, my hysterical reaction would often result in slightly bemused looks from fellow passengers. Much the same look, in fact, that my American boyfriend gave me when I attempted to explain my Scottish childhood and sang it to him at the age of 27. He rather furtively suggested that perhaps I'd got the words wrong, and shouldn't it be 'Stop the bus I NEED a wee wee'? Oh, the shame.

The final line of "and the boys at the back can't swim" clearly overestimates the capacity of the human bladder and the watertightness of the average bus.