talk out (the side of) one’s neck
v. phr.— «Nine-Lives, he started talking out the side of his neck about how Manny was moving out of crack and into dope. He never could stop running his mouth about how much money he was going to be making.» —by Laurence Fishburne Riff Raff , 1994. (source: Double-Tongued Dictionary)
Further reading
If you speak a second or third language, you may remember the first time you dreamed in that new tongue. But does this milestone mean you’re actually fluent? And a couple’s dispute over the word regret: Say you wish you’d been able...