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1.
1.(noun) A fond expression for the name Phil or Phillip.

2. (adj) The state of being extremely, unequivocally nerdy. Phleebes are also known to break expensive laboratory equipment.
"yo phleebes, heard you got so excited about making silver nano-wires that you broke the 1.3 million dollar scanning-tunneling microscope."
by smavis January 23, 2008