Originally Posted by ADA23
Not sure if you're extracting the urine i.e. taking the p*** (and if you are, well done),
Thank you! Just a bit of fun.
Since no one else mentioned it in the thread, I think "sandbags" referred to those used to lighten a hot air balloon during a flight. Like when you think you are going to go down (or slow down, in this case) you start throwing weights overboard so you can make it. IIRC, there were hot air balloons along the route around the same time, so it was a handy metaphor.
