Top definition
A high holiday rivaling Christmas among military personnel. Used in reference to the period of time after porta-potties have been emptied during which one can maaturbate peacefully unencumbered by the smell of shit and urine.
"Hey bro, pass me December's Penthouse, it's Blue Water Day."
by motoboner April 04, 2014
Get the mug
Get a blue water day mug for your girlfriend Julia.