that's your cue to leave
Something you say in a group setting to dismiss the group when you wish to speak with a certain person without the other persons hearing what you have to say.
Bob:"Who are you gonna ask to prom?"
Kevin:(looking around the circle of people)"I'll get back to you on that"
Bob:(to the rest of the circle)"That's your cue to leave"
Kevin:(looking around the circle of people)"I'll get back to you on that"
Bob:(to the rest of the circle)"That's your cue to leave"