The act of fucking someones partner during the day while the other is at work.
The fear of getting caught made the dayfuck I had on Tuesday the best fuck of my life!
After dayfucking my friends wife yesterday, she gave me a sweater of his that he doesn't wear....I love it!
Melanie dayfucked her friend Rachels husband to get back at her for openly flirting with her boyfriend.
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1. One who fucks other people's days.
2. One who fucks other people's shit up, or otherwise causes general mischief.
Did you hear what Micky did to Ron?
Yeah, dude....that asshole was bread to be a Dayfucker.