Don’t know who thought of it first, but it’s certainly been propagated by NewScientist — print story on June 23rd; on-line story on the 19th:
Higgsteria rising as trouble brews for standard model
Excitement about the Higgs boson is ramping up ahead of a hotly anticipated conference in Australia next month. But even if last year’s tentative signals of the particle are confirmed, a fresh analysis of data from a particle accelerator in California suggests that this may not complete the standard model of physics.
A portmanteau of Higgs and hysteria. What happens when theoretical physicists get excited.
The word has been picked up enthusiastically by other science sites.