jeniffer's sickeningly filthy minge made the boys gag. so jason did the decent thing; he bought her a multipack of douches for christmas. "oh great!" she exclaimed. "now my vagina won't smell of rotting seafood!" she went into the toilet and got busy.
It refers to an individual who disappears off the face of the earth, in other words, never calls you back, and, a few months later, you randomly meet at a bar and acts like everything is perfectly normal and greets you with the biggest smile on their face.