An evening/night where you choose to relax at your own leisure, doing whatever you want to do for your pleasure, without giving a f**k about anything else.
Girlfriend: You coming round tonight to watch a romantic film with me? Boyfriend: No, it's a free and easy night for me.
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A night when mom/dad doesn't feel like cooking or there's too many left overs in the fridge.
"I have a headache. It's free-night, eat that pizza or I'm going to toss it out"