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Dakota Johnson ’s the queen of savage rid-or-die energy -- because she once mailed a gallon of gorilla poop to her friend’s ex.

Yup, you heard right -- Dakota spilled the dirty tea on Vanity Fair’s Lie Detector Video Series, saying she figured the guy wouldn’t be watching anyway ... so she just confessed to ordering a delivery of some grade-A, stinky revenge.

Dakota said the messy deed went down a few years back ... and when asked where one would even go to cop a similar gift, she didn’t miss a beat -- pointing folks to the website she ordered from, which has since rebranded itself, swapping in the word "poop" for "sh*t."

The actress was low-key impressed with the menu, saying you have your pick of doody, offered in a few different quantities -- the site serves

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