Canelo Alvarez Claps Back at 'Little Bitch' GGG for Calling Him a Steroid Cheat

Canelo Alvarez is pissed GGG publicly blasted him as a longtime steroids user -- and the Mexican boxing star is firing back with some good ol' fashioned American trash talk.

"I'm gonna kick your f**king ass ... little bitch," Canelo wrote on social media.

Alvarez ain't just talking ... he's also showing Gennady Golovkin how he plans to do it with some lightning-fast shadow boxing!!

FYI, GGG destroyed Canelo in an interview on Wednesday ... calling his tainted beef excuse a bunch of BS -- "It’s not Mexican meat. Canelo is cheating. They’re using these drugs, and everybody is just trying to pretend it’s not happening."