play fast and loose
Pronunciation:
verb
Definitions
To ignore proper behavior or social conventions, especially when it suits one's purpose.
Example: I cannot say that there were any outright lies in the editorial, but it does play fast and loose with the truth.
To be recklessly inaccurate, inappropriate, or otherwise ignoring guidelines and conventions.
To act in a tricky, inconstant way, saying one thing and doing another.