come off it
US /kʌm ɔf ɪt/
UK /kʌm ɔf ɪt/

1.
vamos, no me vengas con esas
used to tell someone that you do not believe what they are saying, or that you disagree with it
:
•
Oh, come off it, you don't really believe that, do you?
¡Oh, vamos, no te lo crees de verdad, ¿verdad?!
•
Come off it, you know that's not true.
Vamos, sabes que eso no es verdad.