sure mate 

What you say to a person who you think is lying

Some one has just told you how hard they worked today, but you know differently so you say ‘sure mate ‘

sure mate by Blueford December 20, 2018

yes sure mate

when you don't believe someone and are like course

1)hey i got a new car
me: yes sure mate

1)i swear i did

yes sure mate by alb road October 6, 2016