Under the urban dictionary definition of one direction:

A band of liars that consists of Louis Tomlinson, Harry Styles Liam Payne, Niall Horan and Zayn Malik (who left March 25 2015 I still cry about it.) None of them know how long 18 months is but Directioners still love our baby boys and we will wait forever.
Person 1: what's your favourite band

Person 2: One Direction 
Person 1: but they broke up pick another band

Person 2: I said One Direction ok they are the best boys on this planet and you can't change my mind