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Becuz is a combined noun describing a person who is both your "best friend" and "cousin". Sometimes one acknowledges their friend as their cousin but leaves out best friend or acknowledges them only as their best friend leaving out the family portion. This solves the complicated introduction.
Jake: "Shayna who's that?"
Shayna: "That's my becuz, Amy."
Jake: "Huh?"
Shayna: "Becuz, she's my best friend and cousin. Nuf said."
by Becuzes A&S May 26, 2012

Words related to becuz

because cuz