With reckless abandon phrase
Used in a situation in which someone does something in a very wild and reckless way
Having no time to waste, Jane worked with reckless abandon.
He made a decision with reckless abandon, without caring about the consequence.
The origin of this phrase is not clear.
If you fall for someone's trick the first time then they are at fault.
Are you going to mess with me again? Fool me once, shame on you; fool me twice, shame on me.