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1.
A Flintstones reference. A word that was uttered by Gazoo in an unreleased episode. This word while granting a wish. Similar to Allakhazam or Hocus Pocus. Never used in any other episodes.
"and drunken Fred are all erased from existence as
Gazoo shouts the all-powerful word 'BAYUM!' "
by Bam Rubble April 07, 2006
 
2.
A pronounced form of the word "bam." Not usually used in a sentence, only by itself to enhance various minor actions.
I threw the pen into the cup, and was like "BAY-UM!!"
by APAzero7 June 13, 2011