fast and loose
see play fast and loose.
Examples from the Web for fast and loose
Why should he try to maintain a fast-and-loose relation with Barbara?The Graysons|Edward Eggleston
Three times during this fast-and-loose interval was the fly changed.Lines in Pleasant Places|William Senior
He has been at his old game of fast-and-loose with me; but as I never trusted him, I am not deceived.Charles Lever, His Life in His Letters, Vol. I (of II)|Edmund Downey
Fast-and-loose, a cheating game sometimes played at fairs by gipsies, and also called 'prick the garter'.The New Gresham Encyclopedia|Various