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1.
Acronym to define someone as being better than someone else.
B- Because
I- I'm
B- Better
T- Than
Y- You

Usually said in a smug tone.
Ricky: Why are you being so mean?
Josh: BIBTY

He was so BIBTY while sitting in starbucks siping his coffee with his MacBook Air.
by Josh Jarvey February 13, 2008