The story somebody will tell you after ratting you out on something, the purpose being to keep you from kicking his ass for ratting you out in the first place.
John ratted me out for taking a box of printer paper from the office store room, and his rat tale
was that if he didn't tell the boss who took it they would fire him.
Adj.: A type of tattoo that is adult or pornographic in nature.
Bob just got a pornament tattoo of his wife. It features her large, saggy breasts and a shaved vagina.