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.