The phrase "cartel boss" refers to a powerful leader in an organized group involved in illegal activities, known as a cartel. The boss is in charge of making important decisions and controlling the cartel's operations. Full definition
A Mexican cartel boss who kills people if they don't like The Beatles feels sub-Tarantino-esque. (filmireland.net)
Although many drug lords have fallen, a glaring exception is Sinaloa cartel boss Joaquin «El Chapo (Shorty)» Guzman, Mexico's most powerful trafficker, who under Calderon has expanded control over the most lucrative smuggling routes. (washingtonpost.com)
But poor Harold also has other things to worry about, the most immediate being his being mistaken by an actual Mexican drug cartel boss as the president of Richard's company, who quickly has him kidnapped for real. (theyoungfolks.com)