Highway 69
The way parents tell each other they are horny in front of their kids without their kids knowing.
Dad: "Hey Hun, where's the turn off?"
Mom: "Oh mhmm, on highway 69."
Dad: "mhmmm"
Kids: "HUR HUR MOM SAID 69!"
Mom: "Oh mhmm, on highway 69."
Dad: "mhmmm"
Kids: "HUR HUR MOM SAID 69!"