What does it mean? I'm really sorry if it's a curse, but it's the first time I've heard this word.
I only know it as a common name for a man. Where did you hear this?
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According to one semi-reliable https://www.urbandictionary.com/define.php?term=Jeffof the latest slang:
A Jeff is a really cool kid who everyone loves.
Someone with a fantastic everything.
Everyone's best friend.
A Jeff will most likely often be