Also "smak"

1) To talk disparagingly about someone.
2) To lie about someone.

Alternately
3) To talk nonsense. "Bullshit"
1) "They've been talking smak about you and making you look bad."
2) "It's not true baby, they're just talking smak."
3) "No, get real, it's not really true, I was just talking smak."
by WordBoy July 10, 2003
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