whos ur mate?

Best definition
whos ur mate?
used when insulting someone for a mistake or embarrasing moment. usually used when someone says a joke that isnt funny, a statement that no one understands or a blonde comment that only the idiot that said it thinks its true. said to the person who made the mistake, or to a friend of theirs.
Idiot Girl: i sware a goldfish cost like a hundred pounds?

Boy <to Idiot Girl>: whos ur mate?

Idiot Girl: i sware a goldfish cost like a hundred pounds?

Boy <to Idiot Girls best mate>: whos ur mate?