Luke Rockhold isn't letting Fabricio Werdum off the hook. 

The former middleweight champion Rockhold recently responded to some heated words (h/t MMAFighting.com) from the former heavyweight king Werdum on Twitter, and things escalated from there. 

[tweet url="https://twitter.com/LukeRockhold/status/844009500201832449" hide_media="0" hide_thread="1"]

[tweet url="https://twitter.com/LukeRockhold/status/844786691936215041" hide_media="0" hide_thread="1"]

Now, Rockhold has added arguably his finest bit of trash talk to date to the mix, bringing USADA into the mix. 

[tweet url="https://twitter.com/LukeRockhold/status/844977453118337024" hide_media="0" hide_thread="1"]

Regardless of how this all shakes out, we gotta say, the trash talk has piqued our interest, and we'll gladly watch Rockhold vs. Werdum in a cage, on the mats, or anywhere else.