During post intercourse, the act of urinating inside the female vagina.
After their hot night of romantic love making, Justin felt the urge to Bladder Bag Jennifer.
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When you pour a box of wine into a camelback and your kidneys become britta filters when you pee it out. This phrase is often said in a Brooklyn accent.
"You brought the Franzia? Is it a Britta Bladder Bags night?!"