Stamp dat is another way to saying stop that. Not to be confused with an envolope Stamp. This is generally usued when people want to say it in a funny manner.
Any tattoo on a woman that states the year that she was born thus making it easier to tell if she is or is not jail bait. Normally found in the form of an est. 19** on the lower back aka tramp stamp .
"Dude I was rounding third and heading for home when I saw her date stamp. What a buzz kill."