Simple past tense and past participle of chat.(verb)
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Use "chatted" in a sentence
"Palin chatted with Sen. John McCain by phone last Friday while traveling through Ohio, Recher said, the first time the two have spoken since the book hit stores."
"When Mass ended and we were leaving the church, he once again chatted with her a bit, as well as my son, in a friendly and NOT creepy manner (I was abused – NOT by anyone affiliated with any church, mind you … but it does give me a strong 6th sense for creepy pedophiles)."
"At Yankee Stadium Sunday, McCain chatted on the field with Oakland A's Manager Bob Geren, who asked what it was like to run for president."