xkcd: Malamanteau

Malamanteau is a portmanteau of portmanteau and Malapropism, whereas malamanteau is also a Malapropos of portmanteau. (BBC News America: Malamanteau Wikipedia)

Neologism is a newly coined word that may be in the process of entering common use, but has not yet been accepted into mainstream language.

Portmanteau or portmanteau word is used broadly to mean a blend of two (or more) words or morphemes and their meanings into one new word.

Malapropism or Dogberryism or acyrologia is the substitution of a word for a word with a similar sound, in which the resulting phrase makes no sense but often creates a comic effect. It is not the same as an eggcorn, which is a similar substitution in which the new phrase makes sense on some level. Occasionally a phrase, rather than a single word, replaces the original word, for example Stan Laurel said “What a terrible cat’s after me!” (i.e., catastrophe) in Any Old Port!