Wimp

A wimp is a neutral subatomic particle that interacts weakly with matter. It is the acronym of Weakly Interacting Massive Particle. It is one of the candidates to explain dark matter.
Wimps are often opposed to MACHOs, Massive Compact Halo Objects, which could either be brown dwarves or compact stars such as stellar black holes, old neutron stars or white dwarves, which could also explain the nature of dark matter.