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Pronounced: Que-bee ; noun ; slang.

1. Cubic Zirconia gem; a imitation diamond.
2. Someone or something fake or not authentic.
3. Describing someone who is square (cube) or uncool.
1. "Look at this sweet gem I got my girl, she'll never know it's a cubi."
2. Dawg, that fakester's a cubi!"
3. "Check out his gear, what a cubi!"
by Dr. Cubitron June 13, 2006
Short form for calling someone a cunty bitch
You're mom is a cubi.
Shit my teacher is a cubi.
Wow I want to hook up with some cubies.
by Court Leacon May 14, 2007