A military term for home-brew piss. Many Royal Marines are instructed to take a sip of their swampjuice in the mornings in order to determine their waterlevels.
"James ate a shitload of asparagus last night and his swampjuice went toxic. When he treated the lads to a little taste-test this morning, four of them ended up in sick bay."
by Roofus Wainwright May 26, 2007