phrase requests - Idiom or expression that would imply "someone is a habitual liar"


I'm looking for an idiom or expression for describing people who tell lies out of habit (so you cannot trust them at all).


I know that these people are called "compulsive liars", but I'm not looking for psychological terms.


Is there any idiom or expression for describing such people?


For example:



"Did X tell that to you?! Come on, don't believe him/her. Don't you know he/she ___ (=is a habitual liar)?"




Answer



I've often heard "lies like a rug"


From McGraw-Hill Dictionary of American Idioms and Phrasal Verbs:



to tell lies shamelessly. He says he didn't take the money, but he's lying like a rug. I don't believe her. She lies like a rug



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