|1.||splash my boots|
Verb, transitive: "To splash my boots" is a British army expression meaning to go for a pee in the outdoors (on manoueuvres, etc. when a regular lavatory isn't available.) The action of forceful micturation against a tree or similar tends to cause a splashback onto the boots.
I'm bursting for a piss. I'm just off to splash my boots.