- This term is used by people to express that something will undoubtedly happen. The phrase most definitely was derived from the word definitely in order to emphasize the surety of a situation. Since this phrase became so popular, the user probably wanted to shorten it from a polysyllabic word to a disyllabic word in order to improve its ease of use, so mos def was coined
mos def
adverb; clipping
slang phrase meaning most definitely; undoubtedly; most definitely is a repetitive alteration of the word definitely since it has the same meaning
Etymology : phrase formed by the clipping of the 't' in the root word most + clipping of '-initely' in the word definitely
Source : "Are you going to Esperanza with her?" "Mos def. She asked me the other day." (Lunch Conversation, November 1, 2008)
Last modified: 26 November 2008