He had the effrontery to say I was lying.

竟敢说我撒谎。

How can he have had the effrontery to say “Piss off!” to you?

会这样无耻，竟然对你“滚开！”呢？

This is a despicable fraud. Just imagine that he has the effrontery to say it.

这是一个可耻的骗局。竟然有脸说这样的话。