Do the dirty on somebody Definition 1 of 1Pro Tip 1/3Emotional Weight The phrase can have strong emotional impact, implying deep betrayal. She really did the dirty on me by spreading rumors. Pro Tip 2/3Informal Usage It's casual and might be inappropriate in formal settings like business meetings. Jon did the dirty on us in the worst possible way. Pro Tip 3/3Negative Connotation Using this phrase can show that you feel wronged and upset. After she did the dirty on me, I lost all trust in her.