lie like a trooper
To lie often and barefacedly. My brother lies like a trooper to get out of trouble with our parents. I just can't understand how they still believe him at this stage. You know you have true power when you can lie like a trooper, know that people don't believe you, and know that they'll go along with what you say regardless.
lie like a trooper
tell lies constantly and flagrantly. Compare with swear like a trooper (at swear).