Whenever challenged with words unknown we go first to the OED then to Finnegans Wake. We did so this morning looking for meep, following yet another Language Log thread. We found meep in Joyce’s Finnegans Wake, on page 276, in footnote number 4:
“Parley vows the Askinwhose? I do, Ida. And how to call the cattle black. Moopetsi meepotsi.”
A meep, then, is a calf, and a moop, the calf’s mom.
The moral of me epistle can be found in today’s Boston Globe, where the principal barning the word learns who abuses meep, steps in moop, for the pot (principal), trying to silence the kettles (students) back, starts them whistling, creating a word stampede:
“That was the first joke of Willingdone, tic for tac. Hee, hee, hee! This is me Belchum in his twelvemile cowchooks, weet, tweet and stampforth foremost, footing the camp for the jinnies. Drink a sip, drankasup, for he’s as sooner buy a guinness than he’d stale store stout” (p. 9).
Let the peeps meep, for as Robert Frost said, “…there must something wrong / In wanting to silence any song” (“A Minor Bird”).
The Coming of the Toads 
Reminds me of Bart Simpson’s “meh”, which is used to convey indifference: Question, “Isn’t the sunset spectacular?” Answer, “meh”.