a word invented by the greatest show ever,
The Simpsons.
it was used in the episode
Hungry Hungry Homer originally aired on
March 04 2001.
Homer: Kids, how would you like to go to ... Blockoland!
Bart +
Lisa: Meh.
Homer: But the
TV gave me the impression that --
Bart: We said, "Meh!"
Lisa: M-e-h, meh.