Definitions include: To forget about it. Expression of coming to the end of something of previous concern. To express complete unconcern. "I started to get upset at what she had done, but then I decided PISS ON IT." "I tried to warn him of what was going on and he just ignored me so PISS ON IT"
Definitions include: A expression saying that someone doing something they can't or someone saying they will do something is false. Example: "I'm gonna dunk this 10 foot rim, ready?" Other says "How old are you?" He says "12." Boy says "That though.... Other ways of pronouncing it:That-Dhat Do(pronounce dat-do)