1. Short for necrophiliac, or someone who fucks dead people. Generally a sick motherfucker in general.
2. A very hateful rapper who sings about death and other non happy things. Also a sick motherfucker.
Sick Guy: Yo last night i was screwing a dead chick while listening to Necro!
Normal Guy: Dude you are fucking weird! Necro!
Note: Be careful while calling someone a necro, because it may be mistaken for negro. Unless you are a large black man yourself, yelling necro may cause problems.
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