"King's Row" is an expression that means everything is going really well as much as it is a way of saying you, the speaker, appreciate the other person whom you are addressing.
It is not a reference to the 1942 movie directed by Sam Wood that featured Ronald Regan. Ann Sheridan, and Robert Cummings.
It has originated among snowboarders, skiers, and locals along the California/Nevada border in the Tahoe Basin.
George Grey: "Hey, how's it going?"
Oscar Pistorius: "King's Row, King's Row...(mate, man, buddy, friend, amigo, brother, sister, etc)!"
KING ROW: An idea place in life, or place of opportunity, ideally spoken about to troubled adolescents, commonly referenced as high school graduation, or completion of difficult task
Random southern mother: I had to sacrifice a lot to get you to the KING ROW, now you there you on yo own.
Child: Mama what is the KING ROW.
RM: You will know when get there.