MACHO is an acronym used by astronomers to refer to a new kind of astronomic body. According to one website,

MACHO stands for Massive Compact Halo Object; the MACHO team is searching for gravitational lensing events that might reveal baryonic dark matter in the galactic halo. As of 1 September, the MACHO project started nightly observations on the 0.9-m telescope.

Another site describes it as follows:

Because light rays are bent when they pass close to a massive object, light from a distant source may be focussed by a closer object to produce a sudden brightening of the distant object known as "gravitational microlensing''. If there is a significant population of faint and small mass stars or Jupiters in the Milky Way, gravitational microlensing of distant stars might be common enough to be detectable. A microlensing event would be the explanation for an otherwise unpredicted increase in the brightness of one of the targets stars, followed by a similar decrease in brightness, returning the star to its original intensity. Hence, the monitoring of the brightness of distant stars looking for the characteristic brightening and subsequent fading might provide proof of the existence of unseen MAssive Compact Halo Objects (MACHOS)?

This word is a blend using the existing words scandal and candelabra and presumably relies on the metaphor of the candelabra, which has many arms and branches. Thus it is a scandal which has many branches and ramifications. I thought it was a new word, recently coined to describe the Clinton scandals:

Award winning liberal journalist, Roger Morris, penned one of the better Clinton bios to come out last year, "PARTNERS IN POWER: The Clintons and their America". Morris' effort is perhaps the most comprehensive treatment of the ever metastasizing Clinton scandalabra yet put between hardcovers. Therein, Morris reports an incident which demonstrates that biting fetishes aren't limited to randy play by play announcers.

WIMP is an acronym for a kind of `particle physics candidate' i.e. a new kind of matter still under discussion by physicists:

There is broad class of particle physics candidates for the dark matter that are referred to as Weakly Interacting Massive Particles or WIMPs. This class includes several proposed particles (massive Dirac neutrinos, cosmions, SUSY relics) that have masses of order a few GeV to a few hundred GeV and interact through the exchange of W's, Z's, higgs bosons and other intermediaries.