In typography, kerning (less commonly mortising) is the process of adjusting the spacing between characters in a proportional font, usually to achieve a visually pleasing result (Wikipedia).
Okavango in South Africa is a particularly difficult word to kern correctly, as are all words with an AV or VA combination in them. You can see in the sign below that the AVA part is differently kerned from the rest.
And keming is the result of improper kerning. The word keming is what the word kerning looks like when kemed. Here are some examples of keming.