Let your hair down 

In general: to leave behind one's inhibitions or to behave in a way that is free from social limitations or any code of conduct

Let your hair down and tell me all about yourself. Come on. Let your hair down and tell me what you really think.

Let your hair down by Harald Fairhair January 5, 2012

let your hair down 

going overboard with effort or giving more effort than is required for a simple task

wow you really let your hair down today at noon ball, i think you actually killed a guy

let your hair down by andydalton January 29, 2012