Farrah Abraham -- Pays Dearly for Lip Service

No, a backdoor didn't smack Farrah Abraham in the face ... she got what could well be the worst lip injections in the annals of medical history.

Farrah may look monsterish, but that didn't stop her from posting the pics online herself with the caption, "Girlfriends don't say I didn't warn ya ! #BOTCHED California #ER #fixit"

We're told Farrah was getting a new procedure, where the doctor puts an implant in the patients lip ... which in theory is cost effective because you don't have to maintain the work with fillers.

Farrah says she researched the doctor and the procedure and decided it was a safe bet. She was wrong. She says the doctors injected her with an anesthetic before the procedure ... and believes she had a MAJOR allergic reaction.

Farrah is no stranger to artificially enhancing body parts, but this takes the cake.

The "Backdoor Teen Mom" star tried to put a good face on it, comparing herself to Leela from "Futurama."