Short answers, pulled from the story.
The word obfuscation derives from the Latin verb obfuscāre, which means to darken. Tom McArthur edited The Oxford Companion to the English Language in 1992 and defined the term as obscuring intended meaning through confusing language.
Mohamed Atta sent an obfuscated message to other conspirators before the September 11 attacks occurred. This communication achieved secure status without relying on advanced technology or encryption software by using code phrases like semester for planned attacks scheduled that month.
The Drug Enforcement Administration reported 353 different code words used specifically for cannabis in July 2018. People commonly say 420 when referring to cannabis despite its illegal status in most places.
A 2002 paper by Chow S, Eisen P, Johnson H and others detailed white-box DES implementation for DRM applications. Software obfuscation deliberately makes code difficult to understand without changing its behavior to protect intellectual property rights.