Translated from Chinese's 不三不四，which literally means "not three not four", and metephorically means you're talking non-sense or that this topic of conversation is not based on truth.
Bob: What is he talking about, mountain people mountain sea?
Vincent: Iono man, he's just being not three not four.
Jessica: Hey have you heard about bob's new boyfriend?
Tiffany: Oh stop talking about that not three not four stuff!
© 1999-2015 Urban Dictionary ®
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