scum bag

He's a real scum bag for lying to his own family.

他对自己家人撒谎，真是个卑鄙小人。

Only a scum bag would steal credit for someone else's work.

只有下流坯才会把别人的功劳占为己有。

Leaving a dog alone in a hot car is something a scum bag would do.

把狗独自留在炎热的车里是卑鄙小人才会做的事。