sim simma means: A phrase that is used to acknowledge or declare one’s greatness. It is most commonly used in a congratulatory tone. 2. informal greeting among friends. Replaces or adds to “yo” for “hows it going” or “whats the up?” 3. A response to greetings. Depending on the vocal tone, it can be used for a variety of moods. 4. Beanie Man used nonsensical lyrics at the start of the song “Who Am I?” (in Community Dictionary, added by Jaylee Barnett)