We said there warn't no home like a raft, after all. Other places do seem so cramped up and smothery, but a raft don't. You feel mighty free and easy and comfortable on a raft.

Solecism (plural Solecisms)

n. A grammatical mistake or absurdity, or even simply a non-standard language usage.

• We don’t need no education! (Pink Floyd’s infamous double-negative self-refutation.)
• This is just between you and I. (Hypercorrection to avoid the common, nonstandard “you and me” form in the subject of sentences…in this case, “me” would have been correct, the standard pronoun for the object of a preposition.)
• Surely there is no fitter solecistic archetype than Huck Finn. (While fitter is a valid construction, the grammatical norm in English is to say “more fitting” — an example of how valid language can still be a solecism.)

Etymology:
In ancient Greece, the colony of Soli in Sicily spoke a very corrupted version of Greek, and came to be seen as a model of silly language usage.