Something that's macaronic uses elements, like inflections or specific words, from another language. If you insert Latin words and phrases into your everyday speech, you can call it macaronic.
The adjective macaronic most often describes a satirical writing style that adds Latin endings to everyday language, or uses puns made from a combination of two languages. The word's root is the dialectal Italian maccarone, "pasty food," or "dumpling," thought of as "peasant food," reflecting its sometimes derogatory intent. Macaronic writing is often funny, showing up in humorous poems, novels, and films. In speech, this style is sometimes called "code-switching."