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Definition of Mc-
1. Prefix. A patronymic used to form common Irish and Scottish names, similar to the English -son. ¹
2. Prefix. Used in combination with a non-name descriptive word to form mock names, typically as an insult. ¹
3. Prefix. (business) McDonald's or McDonald's products, such as the McRib or McCafe ¹
4. Prefix. (derogatory) Indicating briefness, shallowness and lack of worth, by association with McDonald's. ¹
¹ Source: wiktionary.com