this is due to insecurity.
girl1: the dude who plays harry potter bought me this bracelet!!!
girl2 to girl3: she is such a liar!
1. someone who represents one set of facts, while knowing that a
different set of facts prevails;
2. (popular) someone who having led others to believe one thing, does
a different thing; a promise-breaker;
3. (colloquial) someone whose general conduct, level of reliability,
relationship with truth, and past preformance leave him or her with
little to no credibility in peoples' opinion;
Ministers Stephen Harper and Brian Mulroney, along with a pissant
Minister of Defence Peter MacKay.
Seeing that liar at the Tomb of the Unknown Soldier make me want to vomit.
That liar has disgraced the office of President more than any other officeholder.