Fascinating intellectual breakthroughs regarding reality, language, existence, knowledge, perception, or human behavior which are completely unprovable and utterly without use, and therefore of no real consequence to anyone. See also: philosophy
Etymology: the mental counterpart to masturbation; i.e. a process that is very pleasurable but hasn't accomplished anything at the end.
The Sapir-Whorf hypothesis states that language influences human thought, so that native speakers of different languages think about concepts in incommensurably distinct modes. Linguists and psychologists contend fiercely over the validity of this claim, oblivious to the fact that it is intellectual masturbation.