Ray Rice's Wife -- Cusses Out Internet Troll ... 'Get a F**kin Life'

Ray Rice's wife just WENT OFF on Instagram -- cussing out an Internet troll who ripped her for defending her husband.

Janay Rice hurled the expletives at a user named "Gossipallday" -- who had commented on a post Janay wrote this morning in which she defended Ray and blamed the media for ruining their lives.

"Gossipallday" wrote ... "Girl shut the hell up!!! Weak ass little girl!!! How dare you, excuse your HUSBAND'S behavior for a check??!"

Janay fired back ... writing, "And who asked you! Bitch bye get a f**king life and stop worrying about mine. Typical lame broad."

Earlier today, Ray had said Janay was strong and the family was "in good spirits" -- but it's clear, she's still very much on edge.