American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
Stage 6 is being billed as a whopper, and I've been told it's extremely technical in spots.— This Just In
It's even better than that, because it wasn't a whopper -- she spoke volumes of truth by dodging around what she didn't say outright.— Latest Articles
Who hoo … time for a whopper (kidding I hate that stuff)— Balanced Health and Nutrition Rebecca Scritchfield, RD
But you'll need big hands to handle this whopper, which is wider than most phones.— Consumer Reports Electronics Blog
Yet, during the same interview, McCain told another whopper (or at least an out-dated claim): that the American public "overwhelmingly" embraced his vice presidential choice, Alaska Gov.— Consortiumnews.com

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word several times a year.