Wag one's tongue; speak about others and reveal secrets or intimacies(verb)
WordNet. Princeton University. 2010.
Use "dish the dirt" in a sentence
"Before us squats her super grass a bearded Afro-Arab merchant seaman who for the price of what I'm earning in a year will dish the dirt on a ring of corrupt customs officers and policemen operating in Liverpool's dock land He speaks only meagre English, his mother tongue being a classical Tanzanian-flavoured Swahili."