What the hey!
Definition 1 of 1
Pro Tip 1/3Informal Usage
Use 'what the hey!' in casual conversations, not in formal situations like job interviews or business meetings. 
So you don't know how to dance? What the hey, let's join the class together!
Pro Tip 2/3Sudden Decision
Say 'what the hey!' when you make a spontaneous decision or accept a situation without overthinking. 
They forgot my fries, but what the hey, I'll eat it anyway.
Pro Tip 3/3Mild Surprise
'What the hey!' can show mild surprise, less intense than shock or amazement. 
What the hey, it's snowing in April!