OKAY cool
A term often used after someone has admitted their undying love for you, plans to move in with you and is willing to leave their boyfriend/girlfriend for you, but you are too smart to fall for these false promises and cannot reciprocate the love they feel for you.

Particularly popular in London and surrounding areas including St. Albans, Luton and KENT.
1: "Baby, I love you, you mean the world to me. I wanna spend the rest of my life with you. I'll move in with you and leave my girlfriend for you. You're amazing"

2: "OKAY cool"

(syllables can be extenuated if you're feeling particularly ghetto, for example: "OKAYYYYYYYYYY COOOOOOOOOOL")