Illegitimi non carborundum is a mock-Latin aphorism, often translated as "Don't let the bastards grind you down". The phrase itself has no meaning in Latin and can only be mock-translated.

Dog Latin or cod Latin is a phrase or jargon that imitates Latin, often by "translating" English words into Latin by conjugating or declining them as if they were Latin words. Dog Latin is usually a humorous device mocking scholarly seriousness. It can also mean a poor-quality attempt at writing genuine Latin.