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1.
A caucasian named "Brian" who portrays himself as a black man. Normally used as a derrogatory term.
<Brian> Sup, ma nigga!
<Jon> Jesus Bayim, stfu.
by Concerned February 23, 2003
 
2.
One who is quite like Brian but is not completely on the same scale. Often considered as a bad form of Brian.

Sometimes spelled Bayium.
"Stfu, Bayim!"
by Lum February 22, 2003