Pareto’s Law and Language LearningLet’s repeat the math for Chinese. The Hanyu Da Cidian contains 370,000 words, whereas 2500 words (1710 characters) are necessary in order to “read Chinese newspapers and magazines and watch Chinese films”, according to the HSK test(level 5). That’s 0.68% of the total number of words contained in the Hanyu Da Cidian!
(Goyal ставит в тупик).
In general, the universal language on the Internet is English, or more exactly a vague collection of languages called "English" because their common origin is the national language spoken in England by the English. That national language has spread over the world, and several variants such as American (US) English, Australian English, etc exist. A great number of people whose native language is none of the variants know English as a foreign language. They typically use a more or less simplified variant, e.g. excluding most of the idioms of British, American, Australian etc English. Of course, they make mistakes, and sometimes the "English" used by people as a foreign language on the Internet is almost incomprehensible to anyone else. In addition, people who use English as their native language do not know how to spell difficult words, since they basically know English as a spoken language.
Скорее всего, от тюркского kaçma "не беги, стой". В русских текстах уже у Афанасия Никитина.