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This article critically examines the hypothesis regarding the emergence of the sound o in the place of the expected a (and, accordingly, in written form, the occurrence of о in the place of the expected а) is a regular mechanism marking the informality of a word (its association with slang, colloquial language, and other non-standardized areas of the language). It shows that externally similar phenomena conceal completely different linguistic mechanisms. In particular, quite often the appearance of о is a side effect of the shifted stress in word inflection. The examples considered confirm a general principle of spell checking: slang and colloquial words cannot be used for checking. It is claimed that this principle should be taken into account in spelling guides and references.
Alexei Shmelev (Tue,) studied this question.