i tell you what
Something a loudmouthed man says to start or end any conversation, even if he has no idea what he’s talking about. It’s like the verbal equivalent of a honky-tonk shout.
I tell you what, I’m gonna win this poker game and then I’m gonna kiss your mother.
I tell you what, I’ve got more brains than that chicken you bought at the fair.
I tell you what, I’m gonna beat that dog up and then I’m gonna eat it.