A trick to using malapropism is to ensure that the two words (the original and the substitute) sound similar enough for the reader to catch onto the intended switch and find humor in the result.
Positivism is a philosophical theory stating that positive knowledge is based on natural phenomena and their properties and relations. Thus, information derived from sensory experience, interpreted through reason and logic, forms the exclusive source of all authoritative knowledge.
To posit something is to assume or suggest that it is true. You can posit an idea or opinion. When you posit, you submit an idea or give an opinion. Scientists posit many ideas â called hypotheses â that they then try to prove or disprove through experimentation and research. In science, you hear about positing a lot, and the same is true in math and logic.