noun. An ass-whomping cohort.
Real citation: "She's still trying to be this kick-ass double act with Kara, trading lines and being co-bad-asses."
(Jacob, "Scar," Television Without Pity, page 4, http://www.televisionwithoutpity.com/articles/content/a427/index-3.html)
Made-up citation: "There's a fine line between a sidekick and a co-badass. The distinction may be spandex-related."