Green’s Dictionary of Slang

1. God.

2000		Little Worker newsletter 🌐 what? Oh my, oh my, oh my...It is not Almighty God the one and only? Then, who is the Head Honcho, the Big Kahuna, the Mero Mero?
2002		Cypress Hill Sl. Gloss. 🌐 mero mero: god, the greatest, the biggest.

2. a gang leader; thus ext. to any important/admirable person.

2001		mercury.beseen.com 3 Dec. 🌐 Que Rollo!!! Keep up the good work you guys are the Mero Mero’s de la Musica Norteno You need to come and play in Las Cruces one of these Days show everyone here what a bad ass concert you guys give !!!!!
2002		Nat. Alliance of Gang Investigators 🌐 This leader appoints a second in command and issues orders to the soldiers. The leader is called ‘Mero Mero,’ which means Chief or Godfather.