Nick Diaz took to instagram following a post from his friend and teammate, Gilbert Melendez.

The post itself, is just a photo of GSP and Gilbert Melendez hanging out like bros. But Diaz saw something different, and he used the opportunity, to not only call GSP a steroid using cheater, but also confess that he would have failed a drug test for marijuana, had he been tested in their recent UFC title fight.

Check it:

Gil’s post that started it all:

Had the opportunity to hang with one of the best in the business. Was good getting know you. Thanks for coming by. Repost from @georgesstpierre Had a nice dinner with @Gilbertmelendez before visiting his El Nino Training Center – Great gym!

A photo posted by gilbertmelendez (@gilbertmelendez) on Feb 25, 2015 at 3:14pm PST

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Props to BJPENN.COM Follower Ismael Herrera for the find.