mero chingon, el, n. — Green’s Dictionary of Slang

mero chingon, el n.

[Sp. sl., lit. the ‘biggest fucker’]

1. (US teen gang) the leader.

1988		Interviewee in Ethos 430: That’s when I started thinking I was all chingon (tough guy, incontrol).
1988		J.D. Vigil Barrio Gangs 177: chingón Someone who is in command and controls the social situation, the top guy; good fighter.
2006		Chingo Bling [album title] El Mero Chingon.

2. (US) an exemplary or admirable person.

2003

C. Mencia CarlosMencia.com 🌐 An extra special thanks to the guy who drove all the way up from Tijuana, Mexico. I would put his name, but I didn’t get his permission. You da man!! Tu eres el mero chingon!