Dysphemism
Overview
In language
Language
Language may refer either to the specifically human capacity for acquiring and using complex systems of communication, or to a specific instance of such a system of complex communication...

, dysphemism, malphemism, and cacophemism refer to the usage of an intentionally harsh, rather than polite, word or expression; roughly the opposite of euphemism
Euphemism
A euphemism is the substitution of a mild, inoffensive, relatively uncontroversial phrase for another more frank expression that might offend or otherwise suggest something unpleasant to the audience...

.

Referring to the paper version of an online magazine as the "dead tree edition" or conventional postal mail
Mail
Mail, or post, is a system for transporting letters and other tangible objects: written documents, typically enclosed in envelopes, and also small packages are delivered to destinations around the world. Anything sent through the postal system is called mail or post.In principle, a postal service...

 as "snail-mail" are examples of dysphemisms.
While "dysphemism" or "malphemism" may be either offensive or merely humorously deprecating, "cacophemism" is usually deliberately offensive.
 
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