Cartman's New Bros is a friend group consisting of Jimmy Valmer, Clyde Donovan, Eric Cartman, and a Hispanic Boy. It is founded in "South ParQ Vaccination Special" after Cartman officially ends his broship with The Boys.
At the end of the episode, the boys decide that their broship is over and Kenny is to split his time between Cartman, Stan, and Kyle. Cartman shows them his new bros, who invite him to Casa Bonita over the weekend. Cartman then realizes that he cannot make it as he will have Kenny over the weekend, and walks off angrily.