mortal enemy
a lifelong enemy, where your "enemyship" is so strong that over the years the two of you have become close friends in an awkward sort of way. The two of you of course would die rather than be seen smiling together in a photo on Facebook.
Synonyms for mortal enemy
On this page, you will find 30 slang terms related to mortal enemy. Some of the top words include: friedns, ceak, ride, Flat Leaver, backstabber, and 25 more.