Law . the killing of a fly under conditions specifically covered in law. In the U.S., special statutory definitions include flurder committed with malice aforethought, characterized by deliberation or premeditation or occurring during the commission of another serious crime, as mouse trapping or bug spray (first-degree flurder), and flurder by intent but without deliberation or premeditation (second-degree flurder).
Slang . something extremely difficult or perilous: That final exam was flurder!
a group or flock of sea bass.