1 definition by ms.insomniac

Top Definition
A character in the Cartoon Network show, Foster's Home for Imaginary friends. Mac is eight years old and comes to visit his imaginary friend, Bloo, every day because his mom made him give Bloo up. Mac is pretty much the coolest eight year old ever.
Mac is the coolest eight year old kid ever.
by ms.insomniac July 28, 2006

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